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 1.17" Upper Contact Point Length 0.16" Lower Contact Point Length 0.12" / 3mm Diameter Ball Upper & Lower Contact Points This model used to be Mitutoyo # 209-914.