Tymate M12-3 RV TPMS (6-Sensor + Repeater)
Priced as of May 23, 2026
4.3(3,476 ratings)Buy on AmazonSaved to your guest loadout. Sign up to also save to your Cabinet (consumables) or Kit (tools you own).
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Prices may varyThe Podium · Top 3 in Tire Pressure Monitor (TPMS)
See the full ranking →This product ranks #3 of 8 in Tire Pressure Monitor (TPMS).
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CarCareTruth's Analysis
Last reviewed May 26, 2026
TL;DR One community reference-gauge cross-check shows readings within ±1 PSI; no independent corroboration was found, so accuracy is provisional. No community follow-up data on long-term sensor battery life was found at time of review; the manufacturer rates CR1632 cells at up to 2 years.
What it is and how it performs
The M12-3 is a 6-sensor external-cap TPMS aimed at RV and trailer owners who need the included RF repeater to bridge the distance to rear axle sensors. FCC Part 15 certification is verified in the fcc.gov database (ID 2BDGI-TS, Shenzhen Huatai Electronics, granted 2023-12-18). One community owner cross-checked all four positions against an Astro gauge at 38 PSI and found a perfect match. The repeater is confirmed reliable on trailers up to 38 feet. One documented design limitation: signal loss does not trigger a timely alarm — Tymate confirmed this is normal behavior — leaving drivers unaware of a dropped sensor for up to 90 minutes.
Who should buy this — and who should skip it
Best fit for RV and multi-axle trailer owners who need extended sensor range and want a driveway-installable system without shop visits. The simultaneous 6-tire display and 5 alarm modes cover typical trailer monitoring needs. Skip it if reliable loss-of-signal alerting is a priority — the system will not alarm promptly when a sensor stops communicating. Passenger-car owners who only need 4 sensors will find more targeted options at lower price points.
Safety and environmental impact
FCC Part 15 certification for the sensor transmitter is verified at fcc.gov (ID 2BDGI-TS). No AC charger is included; the display charges via solar panel, 12V cigarette lighter, or USB, so no third-party charger certification concern applies. No active CPSC recall as of 2026-05-22. The internal display battery and CR1632 sensor cells should be disposed of at a Call2Recycle drop-off location or municipal household hazardous waste — not in household trash.
From the manufacturer
Marketing copy from Tymate, via Amazon. Not editorial.
- •[Auto Solar Charge]: Tymate Tire Pressure Monitoring System M12-3 Blue is Automatic solar charging, using higher quality and more durable solar lithium battery panels, which can extend the use time and help focus driving. Drivers don't have to worry about the continuity of product work often (Cigarette Lighter / USB charging can also be used when there is no sunlight)
- •[Five Types Of Alarms and User-set Alarm Values]: Tymate Tire Pressure Monitoring System M12-3 Blue equipped with five-alarm modes (high pressure, low pressure, high temperature, rapid air leakage, sensor low battery alarm), promptly reporting the abnormal tire condition to the driver to help safe driving
- •[Auto Backlight & Sleep & Awake Mode]: Tymate Tire Pressure Monitoring System M12-3 Blue's auto-adjustable backlight can clearly display the data in low light or strong light environment. Real-time monitoring and real-time display of data is the best helper for driving. It will enter the sleep energy-saving mode after the vehicle stops running for 10 minutes, and will automatically wake up when the car is turned on. Prolong product life while saving energy
- •[Advanced Sensor ＆ repeater]: Tymate Tire Pressure Monitoring System M12-3 Blue equipped with 6 advanced external sensors, which are low power consumption and have a long working life (2 years maximum). Small size, light-weight, high accuracy of sensing tire pressure (error range ≈3psi), and easy installation. It also can withstand harsh environments. The repeater could extend the sensing range beyond 45 feet
- •[Customer Service Alway Here for You]: After the first installation, please turn on the monitor first then install the sensor, and all data will be displayed after driving for 5-10 minutes. The sensor needs motion activation. If you encounter any other problems, please do not hesitate to contact us
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Manufacturer videos
Manufacturer images
Manufacturer specifications
- Brand
- Tymate
- Material
- Metal, Plastic
- Number of Items
- 1
- Unit Count
- 6.0 Count
- UPC
- 191893138588 191893124635 782289672252 712317193565
- Brand Name
- Tymate
- Part Number
- M12-3 Blue
- Warranty Description
- 12
- Global Trade Identification Number
- 00191893138588
- Manufacturer
- Tymate Shenzhen Huatai Electronics Co.,Ltd AUTOTECH
- Model
- M12-3 Blue
- Item Type Name
- M12-3 Blue
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Top Amazon review
↗External — Amazon's most-helpful review for context.
Easy to read; accurate; small; works well; looks good
Overall, this is a pretty decent item. I've only had it for 6 months now, but I really like it. It's especially nice because it's pretty accurate and costs ~$50-60 (wait for a deal) and I don't have to waste money going to get new sensors replaced for $100+ a TPMS sensor. Overall, it was worth the purchase as it's very convenient to see the current pressure/temperature for each wheel (if you don't have that with your vehicle already).This product works by replacing your cap for the air valve with a sensor and nut. Once the cap is off, you thread on the [locking] nut and then put on the sensor hand tight. You then "loosen" the nut which winds up using friction to keep the sensor tight in place so someone (without the included 1/2" offset wrench) cannot remove the sensor(s). It takes an extra 10-20 seconds to add air into each tire because of this mechanism, but it's not a big deal.The unit itself comes with adhesive to secure to whatever surface you want which is very helpful so it doesn't move around easily. It constantly charges via the sun. Something to note: I believe the unit turns on when it senses vibration (via closing a door or starting the engine)--but can be turned on (e.g., the display) by clicking any of the buttons. It will then show whatever data was last recorded from your previous trip, BUT once the car moves it takes about 5 seconds of the wheels rolling to update the data (automatically) to the currents stats. Just be aware of that. It doesn't bother me, personally.The description says it has an accuracy of +/- 3 psi. That's an absolute range of 6 psi--a lot of room for error for my liking. Despite that error being apparently similar to other items on Amazon, I have found with my trusted digital tire gauge that this unit reads +/- 1 psi most of the time. That's really good.There's a lot of settings on the device that you can customize to your liking. Other reviews have stated that once it starts beeping (i.e., the tire pressure drops below a set threshold), the beeping will not stop until the pressure is increased. That is FALSE. All you have to do is hit one of the buttons on the top and it stops the beeping.***Due to the small space you have to tighten/loosen the "security/locking nut", you need the included 1/2" offset wrench (feels like just sheet metal or the type of wrench that comes with furniture). I have an assortment of tools and cannot find a tool that would suffice. Maybe a small open-end 1/2" wrench that is bent or an open-end crowfoot could do it. But a flare nut crowfoot or standard open-end wrench will not do it. I cannot find the included wrench anywhere; so if you lose it, it might not be fun. I WISH THEY WOULD INCLUDE 2 OF THESE WRENCHES IN THE PACKAGE.