1. Slide out of the battery cover along the direction indicated by the arrow. Load an 18650 lithium battery according to the indication of positive and negative poles, and install the battery cover.

2. Slide the power lock switch to the direction of ON, the power is ON, and project the horizontal line.

Switch lights and modes as directed by the function panel. When the instrument exceeds the precision range, the light flashes (800ms) and the sound drops alert.Adjust the instrument to a level position until the light stops blinking.

3. When the work is finished, slide the lock switch to OFF

4. When the power indicator indicates low power, please take out the battery and charge it.

5. If the instrument is not used for a long time, please take out the battery.