
I consider them disposable. It had one for about a year before even a new battery made it keep turning on, but when it worked it worked fine. I come back here to buy two more. They compared them to each other and they totally matched (and matched what I expected from my tires, having charged them just a few days earlier). often in the shade. My only complaint is that changing display units must be MORE DIFFICULT. hold eg I only use liberty units and it's too easy to pull the trigger twice and unintentionally switch (and annoying to have to cycle through them to get back).