Fowler's Xtra-Value Depth Gage & Poly-Cal kit includes a Fowler Electronic Caliper and a Fowler Electronic Depth Gage. Fowler's Poly-Cal... Range: 0-6" / 150mm Polycarbonate Frame Resolution: .0005" / .01mm, Fractions by 1/64 increments. Xtra-Value Depth Gage... Spring loaded with a hold measurement button for ease of use. Super-large display Travel: 0-1" / 25mm Application Range: 0-22" / 550mm Resolution: .0005" / .01mm, Fractions by 1/64 increments