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 0.0008" / 0.05mm Accuracy 1.37" / 35mm Max Measuring Depth - Reach 0.75" Upper Contact Point Length 0.73" Lower Contact Point Length 0.059" / 1.5mm Ball Diameter Upper & Lower Contact Points