Stanley Fatmax Stud Finder 400 Manual Verified -

Wipe the exterior with a clean, slightly damp cloth. Never use solvents or submerge the tool in water.

Always turn off power when working near live electrical wires. The tool is a guide, not a guarantee.

At the exact moment you hear the tone, use the pencil notch on the side of the device to mark the wall on one side of the stud. stanley fatmax stud finder 400 manual verified

Ensure the wall surface is clean and smooth. If the tool is not flush, it will not calibrate properly.

The FatMax 400 features an automatic, continuous live wire warning system. If live electrical wiring is present within 6 to 18 inches of the sensor, the AC warning icon will illuminate on the display. This feature operates independently of whether a stud is being tracked. Deep Scan Mode Wipe the exterior with a clean, slightly damp cloth

Hold the tool completely still. A rapid series of tones will sound while the internal circuitry measures the density of the wall.

This guide covers the specific calibration steps, how to interpret the display, and troubleshooting tips straight from the manual. The tool is a guide, not a guarantee

Once calibrated, you are ready to find those studs.

Move the stud finder slowly and horizontally across the wall. Moving too fast can lead to inaccurate results.