Stanley Fatmax Stud Finder 400 Manual |link|

Use the integrated marking channel at the top of the tool to mark this spot with a pencil. ⚠️ Understanding the AC Wire Detection

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Place the stud finder completely flat against the wall surface.

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Wipe the sensor pads on the back with a dry, lint-free cloth. Dust accumulation can degrade sensor performance. Never use water or liquid cleaners.

A: Yes, but calibration is trickier. Calibrate on the wall first, then move to the ceiling without releasing the power button.

Calibrates internally to ensure continuous scanning accuracy.

If you want a shorter social-media caption, a printable one-page quick reference, or the actual manual PDF link formatted for posting, tell me which and I’ll create it. Use the integrated marking channel at the top

The tool functions normally on wallpapered surfaces unless the wallcovering contains metallic foils or fabric textures. If the wallpaper contains foil, the signals will block, making accurate readings difficult. Plaster and Lath Walls

Features a dedicated, continuous live-wire detection system that senses unshielded AC electrical wiring up to 2 inches (51 mm) deep.

If your Stanley FatMax stud finder is not giving accurate readings, check the following, often highlighted in the manual's troubleshooting section:

As you approach a stud, the LCD bars will begin to fill from the edges inward. Any you are currently seeing on your screen

: The device features continuous AC detection , identifying live wires up to 2 inches deep for safety.

For accurate results, follow these operating procedures, which are essential components of the . Step 1: Preparation

If you are using an electronic "400" variant or the common , follow these calibration and scanning steps: Battery : Requires one 9V alkaline battery . Calibration :

Continuously detects live, unshielded electrical wiring up to 2 inches (50 mm) deep.