Mitutoyo Thickness Caliper-Type Gage Mitutoyo's versatile OD measuring gage for hole diameters, groove thickness, tube thickness, and hard to reach dimensions. Features include... 0-.39" / 10mm Measuring Range 0.0002" / 0.005mm Resolution 0.001" / 0.02mm Accuracy 1.37" / 35mm Max Measuring Depth - Reach 0.85" Upper Contact Point Length 0.58" Lower Contact Point Length 0.24" / 6mm Diameter Disc Upper & Lower Contact Points