Just got my new tire Gauge from Griot's Garage and I have to say I am disappointed. The locking chuck doesn't sit flush and starts bleeding out air from the tire, now you don't know exactly how much air you had in the tire to begin. Then after if you want to reduce air in the tire,it's got a bleeder valve, you have to press a reset button, because it's digital, and it fails to give you a new reading. You have to disconnect the chuck and then put it back on, now you start bleeding air trying to put it on the stem, then trying to reset it. I'm going back to my old Brookstone analog gauge.