I have the Accugauge too. Got mine about 6 years ago, haven't had it calibrated before since its always been within 1 psi or less of every other newer gauge I've checked it against. I believe you can mail them to the company for calibration though. I wouldn't say they're real durable though, the face cover is plastic and I cracked mine when I dropped it in the driveway last week but still reads the same as my backup gauge. STG has them.
I use this one at the track and in the shop. Most of the tire vendors use this one and we have tested them against each other for accuracy. We did 6 Motion Pro Gauges at the last trackday and there was only 1/2 psi variance between them.
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Calvin, 1993 to 2007, I will miss you my friend and will never forget you.....RIP big guy.