Tire Pressure Monitoring Valve Caps Sensor Gauge - Advanced Detection System, 105 PSI Sensing Air Alert Indicator for Cars, Trailers, Bikes - Chrome-Plated, Pack of 4

I wanted to thank this company for sending my parts overnight which was at my request. They got here in time before I started vacation. These people really helped me out and the product works great.

They work, but have a very finicky oring seal on the inside. and unless you get it exactly right. they will cause your tire to leak. the apply pressure to the stem in the middle and the air pressure pushes a red/green indicator in the middle up and down depending on the air pressure from the tire.

These work great. I have some on the front of my Semi, and I really like them. I plan to put a set on each of my little trailers that do not have dual tires next. It is nice to be able to not have to use a gauge every time I leave the yard.

I bought these several weeks ago. Filled tires to desired PSI. Have checked tires, and these appear to be accurate. It's a less expensive method to keep an eye on PSI on my fifthwheel. I will update in a few months. The pruduct was well packaged, was on time, and appear to be well made!

Two out of four work. Disappointed!

These did not work even though the tire pressure was correct. Also, one of the package of 4 was the wrong size.

Easy to use, great product