Features: This digital readout kit can be installed on a variety of woodworking and metalworking machines allowing conversion to digital readout. Remote readout LCD display convenient for reading and operation. The design is novel and has strong anti-interference ability. Quick response speed of 3 m/s, no over-speed error occurred. The display has a magnet on the back, which can be attached to iron and is more convenient to use. It is used to be equipped together with various industry lathes and upgrade old lathe. Specifications: Measuring Range: 0-500mm Accuracy: ±0.006 Overall Length: 63.3cm/24.9in Battery: 2 * 3V CR2032 button cells( NOT included) Weight: 446g Buttons: ON/OFF: Power switch button ABS: Relative measurement and absolute measurement conversion mm/in: millimeter and inch standard conversion ZERO: Data reset(zeroing) at any position SET: In the imperial standard measurement state, each time the button is pressed, the resolution of the fraction part is switched between 1/32,1/64,1/128. Package Includes: 1 x Digital Readout Kit (batteries are NOT included) 1 set x Mounting Accessories .