Item Type: Level Angle MeterMaterial: ABS+Aluminum AlloyWeight: Approx. 77g / 2.7ozProduct Size: Approx. 5.6x5.4x2.5cm / 2.2x2.1x1.0inBattery Information: 2PCS AAA Battery (Battery Not Included)Measuring Angle Range: 4 x90°Accuracy: ±0.2°Resolution: 0.1°Display: LCD Display GlowsWorking Temperature: 0℃- +40℃ (32-104℉)How to Use:1. Press and hold the shell by hand in the off state, first press the button, and then press the ON/OFF button, the LCD displays CAL 0, and it enters the calibration state2. Release 2 buttonsPlace 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 , 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.