So this is the second tire size I've bought from Revain. The first was completely useless. pressure not measured. For $5 it wasn't worth going back. sucks. It is great. Looks very accurate, extremely easy to use and great at night. You know you need a tire gauge at every wrong moment. I love that it takes and holds readings so you can bring the sensor up to your face instead of crouching in a ridiculous position to read the sensor. A GREAT IDEA! It also allows you to vent excess air, which I didn't mention, but it works great. This +++++