Item Type: Digital Inclinometer Material: ABS Color: As shown in the picture Measuring Range: 4x90 Working Temperature: -10~50 Working Humidity: 85% Resolution: 0.05 Accuracy: 2 Battery: 2 x AAA dry batteries (not included) Waterproof Level: IP54 How to Use 1. Press the on/off button and place the bottom plane of the bevel frame on the calibrated platform, the LCD display shows "CAL1" and enters the calibration state, then press and hold ZERO to reset. 2. Place the lower left corner of the inclined plane box on the surface of the platform, and slowly rotate the right side of the inclined plane box along the left axis corner. When the LCD display shows "CAL11", stop the rotation and return to the original direction clockwise to make the base surface of the inclined frame and the platform surface smooth. Wait until the LCD display shows "CAL2". Slowly rotate 90 degrees clockwise along the lower right corner to make the right side and the platform smooth. Wait until the LCD display shows "CAL3" slowly rotate 90 degrees along the lower right. Turn the corners clockwise to make the upper plane and platform smooth. Wait until the LCD display shows "Cal4" and slowly rotate 90 degrees clockwise along the protruding hand corner to make the left side and the platform smooth. Wait until the LCD display shows "CAL5". Slowly rotate 90 degrees clockwise along the lower right corner to make the bottom plane and platform smooth. Wait until the LCD screen displays "Pass" and then "0.00". Slowly rotate 90 degrees clockwise along the protruding hand corner to make the left side and the platform smooth. Wait until the LCD display shows "CAL5". Slowly rotate 90 degrees clockwise along the lower right corner to make the bottom plane and platform smooth. Wait until the LCD display shows "Pass", then "0.00"