I bought a cheap one at an auto parts store last year. Less than half the price. It was difficult to read, gave inaccurate readings and, on top of that, started to leak. I threw it in the bin and bought this Milton model. Milton has been around for over 75 years. Worth the price. (Warning, this doesn't last forever. 40 years ago I pumped up a split rim tire thanks to an inaccurate pressure gauge. It fell off the rim and then hit and fractured my knee. Hobbed in pain for a long time. So, 1/ Buy one Quality sensor - this one , and then 2/ Compare it to other sensors from time to time.)