Stanley Fatmax Stud Finder 400 Manual -

You moved the device during the 2-second calibration countdown. Place it flat on the wall, remove your hand, press the power button, and wait for the beep before touching it again.

The FatMax 400 is designed to take the mystery out of what's behind your walls. According to official specifications from Stanley , this model typically includes: Deep Scanning stanley fatmax stud finder 400 manual

: Ensure your free hand is at least 6 inches away from the sensor to prevent interference. You moved the device during the 2-second calibration