According to the Stanley Fatmax Stud Finder 400 manual, here's how to operate the device:
The Stanley FatMax 400 is designed to make scanning for studs quick and accurate. Key features include: stanley fatmax stud finder 400 manual verified
✅ VERIFIED. I tested this 10 times. If you calibrate on a stud by accident, the unit will assume the stud is "empty space," and you will never find anything. According to the Stanley Fatmax Stud Finder 400
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. If you calibrate on a stud by accident,
Here are the solutions to common problems, verified against the official documentation:
As you approach a stud, the LCD signal strength bars will rise. When you pass directly over the middle of the stud, the Center Vision LED will project a bright indicator light onto the wall, and a continuous tone will sound. Mark this spot with a pencil. Troubleshooting & Common Fixes Erratic Readings or False Positives