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... 0-1.18" / 30mm Measuring Range 0.001" / 0.02mm Resolution 0.002" / 0.04mm Accuracy 4.58" / 116mm Max Measuring Depth - Reach 1.42" Upper Contact Point Length 0.94" Lower Contact Point Length 1.97" / 50mm Diameter Disc Upper & Lower Contact Points This model used to be Mitutoyo # 209-915.