. User’s calibration
a. Turn off the equipment. Put the equipment on a flat and smooth solid surface. (see the following figure).
b. In the shutdown status, press and hold HOLD button first, then press ON/OFF button, until the LCD display reads “CAL”.
c. Keep the equipment still for a period of time and then press the HOLD button, display reads “CAL1”.
d. In the same location, rotate the equipment 180°(see the following figure), then press the HOLD button, display reads “CAL2”. After the “CAL2” disappears, the calibration is completed and then the LCD will show the current angle in high-accuracy-display.
NOTE: ● The calibration must be performed on a flat and smooth surface with the tilt no more than 5°. If it exceeds 5°, display reads “Err”, that indicates the user can’t proceed to do the calibration.
● During calibrating, the level also can not be beveled or moved.
● After completed calibration, the equipment automatically replaces from original factory data to consumer’s data, so it must be careful to use this function.
