LCD Digital Display Ruler Aluminum Alloy Vertical Machine Displacement Caliper 0-200mm Item Type: Digital Display Ruler Material: Plastic and aluminum alloy Range: Approx. 0 ~ 200mm / 0 ~ 7.9in Accuracy: 0.01mm Battery Model: CR2032(not included) Type: Fixed Other Functions: Remote data transmission (transmission port attached to the sensor) Uses: Suitable for lathes, milling machines, router tables, planers, table saw fences and other machine tools. Use it to equip and upgrade old lathes and various industrial lathes How e: Load the battery or chain to connect the power supply e, turn on the power, press the ZERO button to return to zero, the HOLD button to save the data unchanged, press the ABS button to measure the relative distance, and the mm/in button can be changed Display unit