1High Accuracy: This woodworking depth gauge utilizes an absolute depth sensor to ensure data accuracy of up to 0.1mm or 0.004inch, with a measuring range of 0to 80mm. 2Independent Magnetic Feet: This carpentry depth gauge features independent magnetic feet, the height gauge vertical measurement is more accurate. 3Locking Screw: This woodworking depth gauge comes with a locking screw to help lock the gauge to hold the measurement. 4Automatic Shutdown Function: This woodworking depth gauge has an automatic shutdown function, which will automatically shut down after a period of use to save electricity. 5Wide Application: This woodworking depth ruler is widely used for woodworking, construction, home decoration, table saws, milling machines and so on. 1 xWoodworking Depth Ruler