It's a Psiclops Extreme. I think the company went out of business. It has a dial on the back (at the bleeder button) which I assume is for calibration. The only way I know to calibrate these things is when tire companies set up tanks set at exactly X psi, and they only do it like, in the pits at Indy or F1 races.
http://www.northernautoparts.com/Pro...ProductId=2879