Turn the StudSensor on while facing it away from a wall. Bring your hand to the back of the StudSensor. If the LEDs light as your hand is brought up to the back, then it is working properly.
Check that the StudSensor is off and then place it flat with its back against the surface of the wall.
Press the "On/Off" button and hold it. Wait for the LED to light to indicate the stud finder is on.
Slide the Zircon StudSensor slowly across the wall horizontally (left or right). As you approach a stud, the red LEDs will light from bottom to top. The green LED will light, and a beep will sound when you've found the edge of a stud.
Mark the edge of the stud when the green light indicates you've found it.
Slide the stud finder past the marked stud edge until the LED lights go out.
Move the StudSensor in the opposite direction to find the other edge of the stud. The red lights will light as they did before. When the green light is illuminated and the StudSensor beeps, you've found the other end of the stud.
Mark the edge of the stud as indicated by the stud finder.
Place a level on the wall to mark the middle of the stud: This is the center point between the two marks you've made.