Before you drill, run this verified safety checklist:

Here are the solutions to common problems, verified against the official documentation:

When the unit detects the center of a stud, an audible tone will sound, and the will appear on the LCD.

Indicates the tool is actively adjusting to the wall density. 📋 Step-by-Step Operating Instructions

Are you trying to find ?

If you are having trouble, move the device to a different location and try calibrating again.

The official instruction manual for the Stanley FatMax 400 outlines the following precise steps for scanning and calibration:

Note: If the "Low Battery" message illuminates on the LCD screen, immediately swap the battery to avoid weakened signal frequencies and false positive readings. 2. The Critical Wall Calibration Process

FatMax Stud Finder (specifically the FatMax 400 or related S-series models like the ) operates by using electronic sensors