I got the roadgear pos Hi-Tec Digital Tire GaugeTG100
and the battery was dead. Drained a bunch of psi before I figured that out. The lady on the phone said to send it back and they'll check it out. I said (among other things) why don't you just send me a replacement now and I'll return this at the same time. She agreed. When I got it I returned it for a refund and got a analog dial gauge.
Roadgear digital tire gauge