Mitutoyo Internal Dial Caliper-Type Gage For checking internal bores, recess diameters and grooves. Features include... 20-40mm Measuring Range 0.01mm Graduations +0.003 Accuracy Max Measuring Depth: 85mm Max Groove Depth: 7mm Minimum Groove Width: 1.2mm Ball Contact Points: 1mm Radius Spring loaded opening Press Button for closing arms. Arms automatically open when button is released Unit is spring-loaded and makes point contact at constant measuring pressure
