Mitutoyo 20-170 mm, Measurable Dia 20 mm Knife-edge type Absolute Inside Calliper measures the distance between surfaces and the hole's inner diameter. This 20-170 mm, Measurable Dia 20 mm Knife-edge type Absolute Inside Calliper is ideal for measuring the deep holes in objects, pipes, and diameter. This Calliper has screws on the lower jaw that enables measurement by adjusting it on the item. The absolute Inside Calliper consists of components such as a digital display with a battery, a measuring scale with low range and resolution, and a handle with point jaws. The Inside Calliper can measure objects with a minimum diameter of 20 mm. Product Attributes: Accuracy: 0.03 mm Battery: SR44 Brand: Mitutoyo Display: LCD Length standard: Absolute electrostatic capacitance type linear encoder Model: 573-646-20 Product: Absolute Inside Calliper Range: 20-170 mm Resolution: 0.01 mm Accuracy: +/- 0.03 mm