Feature: 1. High 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. 2. Independent Magnetic Feet: This carpentry depth gauge features independent magnetic feet, the height gauge vertical measurement is more accurate. 3. Locking Screw: This woodworking depth gauge comes with a locking screw to help lock the gauge to hold the measurement. 4. Automatic Shutdown Function: This woodworking depth gauge has an automatic shutdown function, which will automatically shut down after a period of use to save electricity. 5. Wide Application: This woodworking depth ruler is widely used for woodworking, construction, home decoration, table saws, milling machines and so on. Specification: Item Type: Woodworking Depth Ruler Material: ABS, Aluminum Alloy Resolution: 0.01mm / 0.0004in Reading Mode: Digital Display Reading Range: Approx. 0-80mm/0-3.15in Hole Depth: Approx. 0-55mm/0-2.17in Function: Height Depth Measurement, Auto Power Off Power Supply: 3V Battery x 1 ( Shipped Without Battery ) Use: Used in woodworking, construction, home decoration, table saw, milling machine, etc.. Package List: 1 x Woodworking Depth Ruler