1. Electronically locate hidden ceiling joists and studding.
2. Audible/Visual indication.
3. Requires a 9V battery.

Operating Instruction:
1. Place the unit on a plane to activate and calibrate before use.
2. Slide the unit in constant speed
3. Illuminated top red LED and increasing chirping indicates batten edge.
4. To find the opposite edge by continue sliding tester until top red LED vanishes and chirping decreases, then move tester back, when the top LED lights up with the buzzer increased chirping, it indicates opposite batted edge.
5. Repeat above steps for more accurate location.