Press and hold the power button on the side of the tool, making sure to place the hand below the indicated line shown on the tool.
Continue to hold down the power button and the LED lights will flash to indicate that the tool is calibrated.
Continue to hold the power button and move the tool slowly across the surface. Once a stud is found, all the LED lights will illuminate.
Once the stud is found press the button to mark where the stud is.
If the LED lights calibrate, but no lights appear when it is moved, move the device and calibrate again.
If the LED lights flash repeatedly, move the device and calibrate the LED lights again.