1、Large Screen LCD Display: This digital internal caliper uses a large LCD display to show the value, which is fast and clear to read. 2、Alloy Jaw: This digital display internal caliper uses alloy jaws with chrome finish, which is strong and wear resistant and not easy to be damaged. 3、Metric And English Unit Conversion: This digital display has a unit conversion button on the internal card gauge, and the short button can be used for metric and English conversions (F for fraction function). 4、Locking Screw: This digital display has a locking screw within the gauge that locks clockwise to the current position and loosens counterclockwise to unlock. 5、Wide Application: This digital display internal gage is very widely used, and is mainly used for the measurement of the internal diameter of all kinds of machining. 1 x Digital Inside Caliper Item Type: Digital Inside CaliperBattery: CR2032 3V Button Cell x 1 ( Shipped Without Battery )Specification: Approx. 12.7-216mm/ 0.5- 8.5inReading Value: Approx. 0.1mm/ 0.005inAccuracy Error: Approx. 0.2mm/ 0.01in Clear Reading, Small and Exquisite, Convenient to Use Role: Widely used in various types of machining internal diameter measurement.