Genres 2 Tools In One Laser Tape Measure 40m+5M

Press and hold the primary key for about 2 seconds to power on in the off state, and turn off the backlight automatically after 15 seconds without key operation.turn on laser/measurement: short press the primary key in power on state to turn on the laser or distance measurement.shutdown:press and hold the primary key for approximately 5 seconds to turn off the power in the on state,and turn off the power in the power in the on state,and turn off automatically after 45 seconds without the key operation.do not immerse the instrument in water in water. use a soft, soft cloth to wipe the surface dust. do not use aggressive cleaning solutions. wipe the surface of the optical component [including the laser exit window and the signal receiving  lens] by wiping the the glasses and the camera lens