Stanley Fatmax Stud Finder 400 Manual Verified Guide

Open your manual to the "Calibration" page. A verified manual will explicitly state: "Do not calibrate over a stud." If your manual omits this, it is a generic copy.

The 400 cannot distinguish live wires from studs. If you get a beep in a location where no stud should logically be (e.g., 12 inches from a known stud), it might be a wire. Turn off the room’s power and use a non-contact voltage tester to verify. stanley fatmax stud finder 400 manual verified

Important: Calibrate every time you move to a new wall or change scanning depth. Open your manual to the "Calibration" page