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Best Tire Pressure Monitoring System

last updated Apr 21, 2019

A tool that you may find every prepared driver to have on hand is a tire, pressure monitor, to ensure their vehicle is working at maximum efficiency every time they get behind the wheel. A tire pressure monitor will allow you the driver to know the pressure of your tires to indicate if your tires are over pressured or under pressured to hopefully avoid a flat or burst tire situation while you are on the road. If you want to avoid a possible accident and get to where you are going without incident than investing in a tire pressure monitor is a smart choice. These little devices can be a little pricey but overall will save you more time and money, and if you agree then our guide below will help you find the perfect tire pressure monitor for you and your car.

In a Hurry? The test winner after 13 hrs of research

icon
Vesafe Universal
92.5/100 our score
Effectiveness
93
Accuracy
93
Features
92
Ease of Use
92
Vesafe Universal
Why is it better?

The sensors have already been pre-programmed

Backed by an 18-month warranty

The alerts values can be adjustable

In a Hurry? Editors choice:
Vesafe Universal
Test Winner: Vesafe Universal
Amazon Link
Researched Sources
17
Researched Sources
Reviews Considered
1.3k
Reviews Considered
Hours Researching
13
Hours Researching
Products Evaluated
16
Products Evaluated
Last Updated:
Jordan Coleiro
By Jordan Coleiro:

This list of tire pressure monitors has been put together to show you the best researched and reviewed monitors to allow you to check your tire pressure anytime anywhere and ensure your vehicle is working at max efficiency. A tire pressure monitor to keep your eye on is the Vesafe Universal. We love this addition because it is highly rated, has an 18-month warranty, and setting are customizable.

Sorting Options
Effectiveness Accuracy Features Ease of Use By Default
Rank
PictureProduct
Name
Rating
Shops
#1
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
92.5
Effectiveness
93 %
Accuracy
93 %
Features
92 %
Ease of Use
92 %
Price Comparison Last Updated (22.10.19)
Amazon Link
$72.99
#2
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
91.8
Effectiveness
93 %
Accuracy
93 %
Features
90 %
Ease of Use
91 %
Price Comparison Last Updated (22.10.19)
Amazon Link
$279.00
#3
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
91.5
Effectiveness
92 %
Accuracy
92 %
Features
92 %
Ease of Use
90 %
Price Comparison Last Updated (22.10.19)
Amazon Link
$334.00
#4
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
90.8
Effectiveness
90 %
Accuracy
90 %
Features
92 %
Ease of Use
91 %
Price Comparison Last Updated (22.10.19)
Amazon Link
$68.99
#5
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
90.5
Effectiveness
91 %
Accuracy
91 %
Features
90 %
Ease of Use
90 %
Price Comparison Last Updated (22.10.19)
Amazon Link
$209.00
#6
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
90
Effectiveness
91 %
Accuracy
91 %
Features
88 %
Ease of Use
90 %
Price Comparison Last Updated (22.10.19)
Amazon Link
$49.09
#7
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
88.8
Effectiveness
88 %
Accuracy
88 %
Features
90 %
Ease of Use
89 %
Price Comparison Last Updated (22.10.19)
Amazon Link
$391.23
#8
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
88.8
Effectiveness
90 %
Accuracy
90 %
Features
87 %
Ease of Use
88 %
Price Comparison Last Updated (22.10.19)
Amazon Link
$68.99
#9
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
87.8
Effectiveness
88 %
Accuracy
88 %
Features
87 %
Ease of Use
88 %
Price Comparison Last Updated (22.10.19)
Amazon Link
$365.00
#10
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
87.3
Effectiveness
87 %
Accuracy
87 %
Features
87 %
Ease of Use
88 %
Price Comparison Last Updated (22.10.19)
Amazon Link
$149.99

Top Ten Tire Pressure Monitoring System

1. Vesafe Universal

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
92.5
Vesafe Universal
Amazon Link
Effectiveness
93
Accuracy
93
Features
92
Ease of Use
92
best offer for today
Amazon Link
$72.99
Pros:

The sensors have already been pre-programmed

Backed by an 18-month warranty

The alerts values can be adjustable

Cons:

The display could be brighter

If Vesafe would have updated the display of their TPMS, it could have been even better. As it stands, though, it is a suitable system that will give anyone peace of mind while traveling.

Read more

Design Features

One aspect that may take some time to get accustomed to is the fact that the multi-functional buttons do not click or have any bumps. As such, it can be difficult to know where they are if you can’t see them.

Sensor Design

The batteries inside the sensors can last up to two years and are designed with anti-theft technology, in addition to being waterproof for protection.

Digital Display

As there is only one level of brightness, this becomes too bright at night and too dim in the daylight. Also, it does not turn off automatically when no motion is detected.

Warning System

You have the full control as you can adjust the alert values of the air pressure and the temperature. Either way, you receive both an audible alarm and a visual warning light.

Installation

Special tools have been included to assist you with the installation of this model to ensure everything goes as smoothly as possible.

Overall

Ignoring the display for a second, it is not hard to see why this model has received a strong amount of praise. But, for some, the display will be too much to warrant a serious look.

2. RV 6 Tire-Safeguard

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
91.8
RV 6 Tire-Safeguard
Amazon Link
Effectiveness
93
Accuracy
93
Features
90
Ease of Use
91
best offer for today
Amazon Link
$279.00
Pros:

Your tires are monitored 24/7

A signal booster will not be required most of the time

Has patented flow-through sensors

Cons:

Mounting hardware could be better

What sets this next model apart from the rest of the competition is most definitely its sensor design. Besides being flow-through, the included sensors also will not require a signal booster for most vehicles.

Read more

Design Features

This will monitor your tires 24/7 and provide you with their pressure and temperature information. Also, it is worth noting that the maximum PSI reading is 199.

Sensor Design

The excellence of the sensors was already alluded to and in addition to everything else that was claimed, they are also waterproof and will not leak.

Digital Display

While the included monitor sports a display that is far from awful, some users have expressed that a slightly larger screen would make things easier.

Warning System

With alarm icons, an audible warning, and a red light, you will be alerted when your adjustable tire pressure or temperature has fallen out of your desired range.

Installation

One buyer went in-depth about why they disliked the mounting system here. They claim that the 3M permanent mount is not suctioned and that the cord awkwardly plugs into the back of the unit.

Overall

Even though this system does come with a bit of baggage, it is one of the better models available for RV owners. Of course, this all comes back to its amazing sensors.

3. EEZ RV Products

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
91.5
EEZ RV Products
Amazon Link
Effectiveness
92
Accuracy
92
Features
92
Ease of Use
90
best offer for today
Amazon Link
$334.00
Pros:

Per axle measurements can be configured

Measures up to 210 PSI

The warnings can be configured

Cons:

Can be slow to update the PSI of your tires

In spite of the fact that the EEZTire System can be a bit slow to update the current PSI of your vehicle’s tires, it sports configurable warnings and also long-range sensors.

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Design Features

Even though this system can be a bit slow to update at times, it can still handle up to 22 wheels and up to 210 PSI. Plus, it will also measure tire temperatures.

Sensor Design

For your RV’s, trailers, or tow vehicles, the per axle measurements can actually be configured. Also, if needed, there is an optional booster available if your rig is beyond 53 feet.

Digital Display

This is advertised as having one of the largest monitors on the market at 3.5 inches in diameter. Plus, it has automatic backlighting for nighttime conditions.

Warning System

Both the temperature warnings and the air pressure warnings can be configured to your desired liking.

Installation

Alongside the display, this is also advertised as having one of the easiest installations and operations of any model on the mass market.

Overall

The EEZTire is yet another ideal option for those with a rig. Even though it can struggle to update the PSI readings at times, it offers great versatility and functionality.

4. CACAGOO

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
90.8
CACAGOO
Amazon Link
Effectiveness
90
Accuracy
90
Features
92
Ease of Use
91
best offer for today
Amazon Link
$68.99
Pros:

Each sensor is waterproof

The sensors are powered by easily obtained batteries

Features live readouts of tire temperature, pressure and battery voltage

Cons:

The mounting system could be better

While the display of the last entry could be seen as one of its flaws, that is not the case here. With a wide-angle LCD display, you can see all the real-time information you need in daylight or at night.

Read more

Design Features

Each sensor has its own ID code and you can see real-time information on all four of your individual tires. Plus, it will also display for you your battery voltage.

Sensor Design

Each sensor is rated per IP67 standards of dust protection and waterproofness. This basically means it is sealed against water, snow, and dust.

Digital Display

Again, the wide-angle LCD screen of this unit is a nice touch. It allows you to view the real-time information easily during the day or the night. Also, temperature and air pressure metrics can be switched.

Warning System

You will be warned if the predetermined range of the air pressure or temperature is not meant with an audible alarm. Also, the monitor display will add an additional warning.

Installation

A specific buyer all-but panned the installation claiming the mounting method was unsightly and messy. Meanwhile, others have claimed it will take no more than 15 minutes.

Overall

This is arguably the most modern-looking unit on this entire list due to the excellent monitor. Then again, it stacks up well in terms of performance, as well.

5. Bellacorp

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
90.5
Bellacorp
Amazon Link
Effectiveness
91
Accuracy
91
Features
90
Ease of Use
90
best offer for today
Amazon Link
$209.00
Pros:

No tools are necessary for installation

The sensor caps are waterproof

Suitable for heavy-duty and commercial use

Cons:

Can be tough to install

The sensors on Bellacorp’s TPMS are pre-programmed to be placed on six tires of either a tow vehicle or an RV. With their anti-corrosion and waterproof design, though, they will never leak air.

Read more

Design Features

For up to 34 tires, this system can provide real-time pressure and tire temperature information. Also, a repeater is not required for normal RV usage.

Sensor Design

The design of the sensors has alluded to a bit and indeed, they sport anti-corrosion fittings and are waterproof to three feet. But, they are also pre-programmed for six tires on RV’s, buses, or tow vehicles.

Digital Display

The display itself is fully backlit and 3.5 inches by 1.5 inches. But, what is nice is that it will hold a charge for six continuous days and will also shut itself off when no motion is sensed.

Warning System

The high and low-pressure alarms can be set from 15 PSI to 175 PSI and 157 degrees (for the temperature).

Installation

Even though hardware and suction mounting are included, the set up has been criticized for being too difficult and this is made worse by the rather poor instructions.

Overall

For those of you, who are seeking a TPMS that is suitable for heavy-duty and commercial use, look no further. However, casual users may want to look elsewhere.

6. Zeepin

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
90
Zeepin
Amazon Link
Effectiveness
91
Accuracy
91
Features
88
Ease of Use
90
best offer for today
Amazon Link
$49.09
Pros:

You can replace the batteries on the sensors

It is suitable for all models of cars

Supports solar charging

Cons:

Accuracy could be better

Clearly, one of the most notable aspects of this next system is it utilizes solar charging. With its built-in lithium batteries, it does not require your vehicle’s cigarette lighter socket.

Read more

Design Features

As with most of the other units on this list, this is capable of measuring your tires’ temperature and air pressure and also features dual metrics for each.

Sensor Design

Though these sensors have valve caps and therefore need to be removed when inserting air into your tires, they are still designed to be waterproof and resist corrosion.

Digital Display

The large and bright screen makes things easier on your eyes. In terms of how the monitor is powered, it does not occupy your DC socket as it supports USB charging and solar charging.

Warning System

The alarm values are customizable and when the readings are abnormal, you will be alerted via a visual and an audio alarm.

Installation

Pretty straightforward installation is in order here but unless you are a handyman, you do want to ensure you do not misplace the custom tools that are provided for you.

Overall

Some slight caveats aside, this highly compatible TPMS is going to be optimal for several of you. Just be wary of how quickly this unit can overheat.

7. TireMinder A1A

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
88.8
TireMinder A1A
Amazon Link
Effectiveness
88
Accuracy
88
Features
90
Ease of Use
89
best offer for today
Amazon Link
$391.23
Pros:

The screen is 40 percent larger than previous models

Performs self-diagnostics every six seconds

The included kit is fairly easy to install

Cons:

Accuracy could be better

With the ability to monitor up to 22 tire positions and with a maximum readout of 232 PSI, it is safe to say that this next entry is highly versatile. While the accuracy has been brought into question, the results are there.

Read more

Design Features

Outside of the impressive maximum PSI readout, this is designed to update the positions on a four-minute cycle but the system will run self-diagnostics every six seconds to determine if there are unstable tire conditions.

Sensor Design

While it was only one specific buyer, they did have serious issues with the accuracy of the sensors claiming that the readings were as much as six pounds off.

Digital Display

TireMinder did everything in their power to improve the display of the A1A and the result is a screen that is 40 percent larger than their previous models.

Warning System

Straightforward visual alerts are standard with this system, in addition to audible alerts that will get your attention right away.

Installation

The mounting options and overall installation of this model have been well-received by users, for the most part. What is nice is it offers both front and rear disconnect modes.

Overall

There are so many features to appreciate here. This includes its 40 percent larger screen, the system runs self-diagnostic every six seconds and also its mounting options.

8. Catinbow

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
88.8
Catinbow
Amazon Link
Effectiveness
90
Accuracy
90
Features
87
Ease of Use
88
best offer for today
Amazon Link
$68.99
Pros:

Comes with an anti-skid pad

Features dual-power options

The tire sensors will automatically shut down when the tires stop

Cons:

The screen could be bigger

If you simply read the design features and specifications of this next model, it may appear to be the best of the best. But, due to the lack of user feedback, this could actually be considered a slight risk.

Read more

Design Features

There are two different units for both the temperature and the air pressure that you can switch from. For the air pressure, it will register up to 116 PSI.

Sensor Design

To ensure there is no chance of your tires leaking, these sensors have been designed to be dustproof, waterproof, heat-resistant and cold-resistant.

Digital Display

The sensors will automatically connect with the display and the LCD screen is a suitable size. In addition to this, the monitor can be powered via a mini-USB port or via solar power.

Warning System

Once either reading has reached beyond its set parameter, the integrated alarm in this unit will sound off to alert you that there could be a potential issue.

Installation

Thanks to the fact that you are provided with an anti-skid pad, you can really mount this unit anywhere your little old heart desires.

Overall

It sure would be nice if there were a little more feedback on this model but all things considered, it hits the nail on the head in nearly every major area you look for.

9. TST 507rv

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
87.8
TST 507rv
Amazon Link
Effectiveness
88
Accuracy
88
Features
87
Ease of Use
88
best offer for today
Amazon Link
$365.00
Pros:

Each sensor can get programmed individually

Comes with flow-through sensors

Can be easily removed during seasonal storage

Cons:

The instructions are written in broken English

The number one entry on this list is actually designed for RV’s. One of the many reasons it is so elite is due to its flow-through sensors that allow you to aid air to your tires without physically removing them.

Read more

Design Features

In real-time, this system will accurately monitor both the pressure and the temperature of your tires. Plus, you can custom program the high and low PSI settings on each axle.

Sensor Design

In addition to the fact that each sensor can be programmed individually, they are all flow-through designed. As previously mentioned, this means they can remain on while you pump air in your tires.

Digital Display

The included monitor sports a black and white display which is fully illuminated and quite large. It can be plugged directly into your 12-volt DC charger and runs off of a built-in rechargeable battery.

Warning System

When either the pressure or the temperature has exceeded your preset thresholds, a flashing LED light will go off and also an audible alarm.

Installation

While physically installing this unit is not difficult with either a suction cup mount or dashboard mount, the included instructions make the setup process a bit more complicated.

Overall

Many will be shocked that a device with a black and white display took the top spot here. But, the performance of this unit can’t be understated and that is why it secured the top spot.

10. Yokaro

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
87.3
Yokaro
Amazon Link
Effectiveness
87
Accuracy
87
Features
87
Ease of Use
88
best offer for today
Amazon Link
$149.99
Pros:

It is suitable for all kinds of vehicles

Backed by a 12-month warranty

Features modern-designed sensors

Cons:

The digital display could be easier to see

In terms of the performance of this system, it is hard to argue with the results. However, admittedly, those “results” can be difficult to see at times on the rather lackluster display.

Read more

Design Features

One of the major specifications that you need to be aware of with this system is it is only designed to read maximum tire pressures of 87 PSI.

Sensor Design

The sensors on this system are most suitable for recreational four-wheeled vehicles. But, their modern technology ensures they are waterproof and that they will stop sending signals when no motion is detected.

Digital Display

Let’s just say that the monitor of this system leaves a lot to be desired. First off, it is quite small and secondly, several users claim that it is simply not bright enough to be read in certain situations.

Warning System

The range of the warning system is fully customizable. You can set the alarm to go off when your tire pressures get below 0 to 87 PSI (it is up to you).

Installation

Multiple users and buyers have praised the ease of installation and claimed that it works exactly as advertised.

Overall

For those of you who need to know that your everyday car tires are performing as they should, you should seriously consider investing in this unit. Despite its lackluster display, it does deliver the goods.

Criteria Used for Evaluation

Effectiveness

It was mentioned in the beginning but a TPMS, which again stands for tire pressure monitoring system, is an electronic system that is able to read the current air pressure of your tires and other metrics. No matter which model you invest in, they will all come with the capability of doing this. But, they will not all deliver the same efficiency and readings. For instance, the max PSI they can read will fluctuate from model to model and this becomes important if you need a system for your RV or tow vehicle. Also, while most should relay the information of your tires in real-time, some systems will not update as fast as others.

For the record, in a recreational four-wheeled vehicle, the optimal PSI for your tires will be right around 30 to 35. All systems should be equipped to handle readouts of this magnitude. But, it is not just the air pressure that these systems can detect as most will also be able to detect the tire’s temperature. This can actually be one of the most important parameters to measure in regard to the performance of a tire. With this information, the tuning of the tire pressure, camber, and toe and vehicle balance can be adjusted.

Accuracy

No system is complete without the sensors that get installed into the valves of your tires. These devices are responsible for actually receiving the information that is relayed to the main unit. But, as small as they are, there are several critical attributes that can make or break them. For starters, how about if they are flow-through or not? If they are, then you can leave them installed when you need to pump your tire’s air pressure up. Yet, if they are not, you will need to remove the sensor to add air. Another important feature is its physical design.

In short, they should be resistant to corrosion and waterproof. With proper fittings, they should be all-but immune to any damage from water, dust, or snow. The last thing you want is the sensor to allow air to leak through when it is installed. In addition to this, not all sensors will be compatible with all types of vehicles. Generally speaking, there are systems designed for RV’s and others for regular four-wheeled cars. Oh yeah, and do not forget to assess their accuracy and precision.

Features

Now that the sensors are out of the way, let’s talk about the main unit itself. The sensors work in coordination with the monitor to provide you with the information you need. When looking into the design of the monitor, there are two areas of assessment. The first is the screen of the monitor. First off, it needs to be an optimal size for you to easily view while you are driving. If you have to squint at the screen to view the data, it could turn into an entirely different safety hazard. So, look for a large screen (ideally an LCD screen) and also clear and easy-to-read fonts. Oh yeah, and do not forget about the backlighting as to account for more situations, there should be a way to adjust it.

Now, the second area you want to look at is the manner in which the monitor is powered. While some will require the power from a standard 12-volt DC charger (such as your cigarette lighter socket) others may use a mini-USB port or even solar energy. Either way, look for models with a built-in battery that can hold a charge continuously for a solid amount of time (say a few days).

Ease of Use

This final section sort of caps off your journey, in a way. Installing these systems is not too tricky and only involves two areas. Firstly, you need to mount the main unit in your vehicle. This can either be painfully annoying or really easy; it simply depends if you can use a dashboard mount or suction cup mount.

As for the sensors, this installation process should be pretty straightforward. They simply get inserted into the valves of your tires. Of course, if you ever have any issues with this phase, reference the included manual or online tutorials.

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expert tips icon
Do not leave your life to chance

Do you finally realize the importance of these systems? Even if your current vehicle has one installed, and especially if it does not, you should still consider one as these models can offer excellent perks. Of course, no matter what you decide in the long run, safety should always be your first priority. Do not take this lightly; installing a TPMS can end up saving your life. You just simply never know what can happen on the open road.

Other Factors to Consider

Safety Hazards

Alright, so the entire purpose of this device is to inform you of critical parameters to determine if your tires are running optimally. However, how do you know when they are at unstable levels of air pressure? Well, that is why each system will have integrated warning systems that will alert you of such. Some will alert you via the monitor and others will do so with an audible alert. But, it is best to look for models that do both to be 100 percent certain you get the memo. Of course, most systems will allow you to customize when those alarms go off. However, this leads to a very intriguing question, when is a tire considered dangerously low?

According to U.S. law, pre-installed systems (which will be addressed a little later) will warn you when the tire is 25 percent under its recommended inflation level. Yet, even at 10 or 15 percent, your tires can be weakened. Our advice would be to set your tires at the manufacturers recommended inflation level and set the alarm when they reach 10 percent below it.

Frequently Asked Questions

q: Why is Proper Tire Inflation Vital?

a:

So, this entire guide is based on the premise that you need to keep an eye on your tires at all times. However, why is this necessary for drivers? Why is proper tire inflation so vital and what could happen if you just merely ignore it? Well, both of these questions can be answered with the words of safety experts in the world. See, the National Transportation Safety released some data a few years ago. It was claimed at that time that every year, around 500 people die in tire-related crashes. In addition, around 19,000 people are injured. The scariest part is all these injuries and deaths were noted as being preventable.

While you are not 100 percent protected from an accident with one of these systems installed in your vehicle, your risk of injury will be reduced. Remember, the tires are essentially the foundation for motor vehicles and without them, they are not going anywhere.

q: How Long Do Tire Sensors Last?

a:

Just as with anything else in the world, you can’t expect a TPMS to last your forever. The reality is, the sensors will eventually reach their lifespan and need to be replaced. The good thing is the sensors can be replaced separately if need be. But, that still begs the question of how long they are designed to last in the first place. Well, a lot of it depends on the batteries that are integrated into the sensors. For example, if they are lithium-ion batteries, they could last anywhere from five to ten years.

Then again, some sensors will have replaceable batteries but it also depends on how new they are. It also helps when the sensors are designed to stop transmitting a signal when no motion is detected as this will save battery life over time.

q: Why Does a Tire’s Pressure Change?

a:

It is easy to assume that when you buy new tires, you never have to worry about air being depleted from it. Well, that is just simply not the case as much like batteries that discharge over time, tires are going to lose some air over time. That is just the manner in which they are designed and no, it does not mean that your tires need to be replaced. Air is going to escape the tire and the rim naturally and in around a month, you could see as much as 1.5 PSI lost.

Yet, the ambient temperature can also play a key role. When the temperature gets colder outdoors, your tires will lose air faster. Around every 10 degrees of dropped temperature, you could see as much as one PSI drop.

q: Do Some Vehicles Already Have a TPMS?

a:

There was never a good time in this guide to bring this up, so this slot will have to do. You may be asking yourself why you even need to consider one of these systems as your vehicle already has one pre-installed. Well, if your vehicle is newer than a 2007 model (or a 2007 model) then it most likely does have a system installed already. See, in 2007, the United States Department of Transportation passed a law that requires these systems to be installed in all new passenger cars, trucks, buses, and vehicles with a gross weight rating of 10,000 pounds or less.

So, why even consider investing in another one? Well, there are certain perks that external systems can provide such as their display and reading the temperature of your tires.

q: Can The Sensors Be Stolen Easily?

a:

One important feature that has not been discussed yet, in regard to the sensors, is their anti-theft design. Whoops, looks like the cat was just let out of the bag. Indeed, most sensors will be equipped with anti-theft designs and will not be easily stolen. The potential burglar is probably not going to make it very far if they try and sneak over to remove the sensor from the tire valve.

q: Is Low Tire Pressure Easily Detected?

a:

This last question is a very good one and it really increases the importance of having a system gauge your tire pressure. Even though it is easy to detect when a tire is flat, it is not so easy to see if it is low. To the naked eye, it is all-but-impossible to see or tell if (for example) the tire has dropped around five to 10 PSI. That is why these systems are so great as they will notify you of the exact measurement. Even more so, you could just simply use a tire gauge for quick reading. Either way, do not rely on your impeccable vision and touch as it is just not feasible.