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) Battery Voltage: 3V 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 to Use: Load the battery or chain to connect the power supply to use, 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 1、With LCD display, the reading is easy to read, with inch, decimals, decimal system and metric readings, which can meet different needs 2、Set the "zero point" at any position within the working range to determine the relative distance, easy to operate 3、In the process of machining or machine tool assembly, the assembly fixed on the fixture is measured and positioned 4、High?quality aluminum alloy and plastic material, fine processing and precise measurement data 5、Can be connected to the data line to complete the remote measurement, simplifying the operation 6、Suitable for lathes, milling machines, router tables, planers, table saw fences and other machine tools 1 x Digital Display Ruler