1、Digital inclinometer, the measuring surface is magnetic and can be attached to the metal surface. 2、High‑definition LCD display, high‑accuracy resolution, intuitive display of measurement results. 3、Portable protractor, small size, light weight, easy to carry, suitable for woodworking. 4、Absolute or relative measurements can be made to determine the exact angle or the difference between two angles. 5、Suitable for installing shelves and cabinets, leveling tiles and picture frames, measuring inclined roof angles, installing window and door, etc. Item Type: Level Angle Meter Material: ABS+Aluminum Alloy Weight: Approx. 77g / 2.7oz Product Size: Approx. 5.6x5.4x2.5cm / 2.2x2.1x1.0in Battery Information: 2PCS AAA Battery (Battery Not Included) Measuring Angle Range: 4 x 90° Accuracy: ±0.2° Resolution: 0.1° Display: LCD Display Glows Working Temperature: 0℃- +40℃ (32-104℉) How to Use: 1. Press and hold the shell by hand in the off state, first press the ZERO button, and then press the ON/OFF button, the LCD displays CAL 0, and it enters the calibration state 2. Release 2 buttons Place the base level of inclinometer on the adjusted level; when the inclinometer is stable, CAL 1 will be displayed. At this time, rotate the inclinometer 90 degrees clockwise and place it on the horizontal surface, a few seconds later, will display CAL 2. Pick it up again and rotate it 90 degrees clockwise, the same as below, until CAL 3 is displayed and it will automatically shut down after it is stable, and the calibration is complete. 1 x Level Angle Meter (Battery Not Included) 1 x Manual