1. Put the spirit level on a plane that is not more than 3° (can be compared with the spirit level) and wait for 10 seconds.
2. Press the calibration button once, the display will show CAL1.
3. Rotate the digital level by 180°, wait for 10 seconds, then press the calibration button, the display will display CAL2, after about 5 seconds, the LCD will display "Succ" and the buzzer will beep three times continuously , the calibration is successful.
4. If after calibration, three dashes "-" are displayed on the LCD screen, which means that the level is not parallel to the horizontal plane during rotation, and the calibration is not successful, you can re-calibrate.
