Product Description 209-922 Mitutoyo Dial Caliper Gage - External Type: 0-50mm The Mitutoyo209-922External Dial Caliper Gage has the following specifications: Range: 0-50mm Graduation: 0.05mm Accuracy: +/- 0.05mm Max. Measuring Depth L: 169mm Length Hb: 30mm Measuring Contact Type: R/S Size: 3mm Diameter / Chisel; R0.75mm Mass: 400g lbs Features: Versatile OD measuring gages for groove thickness, tube thickness, and hard-to-reach dimensions. Types of Contacts Upper/Lower: S: R 0.75 / R 0.75 K/K: 2mm Ball /2mm Ball or 1mm Ball / 1mm Ball R/S: R 0.4 / 1.5mm Diameter Carbide Ball RK/K: 1.5mm Ball / 1.5mm Ball S/R: R 0.75 / 2mm Ball R: 2mm / 2.5mm Ball T: 6mm Disc PR: 2mm Diameter / R 0.5 PK: 2mm Diameter / Chisel R 0.5