Mitutoyo 530-312 Standard Model Vernier Caliper has an Metric/Inch dual scale with a measuring range of 0 to 6 Inch/ 150mm with a Lower Scale Graduation of 0.02mm, Upper Scale Graduation of .001 Inch and an accuracy of +/- 0.03mm. This is a High Accuracy model. Features a small face angle of 14 degrees which provides easy reading. Measures Outside Diameter, Inside Diameter, depth and steps. Furnished in Satin Stainless Steel with easy reading graduations. Equipped with a lock screw for holding the sliding jaw position allowing the user to get easy measurements.