Stanley Fatmax Stud Finder 400 Manual Verified Portable -

Place the unit flat against the wall in a vertical position.

Provides clear visual feedback on the tool's readings, even in low-light environments. stanley fatmax stud finder 400 manual verified

When the appears and a constant tone sounds, you have found the center. Place the unit flat against the wall in a vertical position

: Shows real-time information such as edge detection, center finding, and battery strength. lift the device

Even pros run into issues. Here is the official troubleshooting guide for the 400 model.

If you start the calibration directly over a stud, the device will "auto-zero" incorrectly. It will then beep everywhere except the stud. If you suspect a mistake, lift the device, move it 12 inches to the left or right, and repeat.