Usually caused by improper calibration. Re-calibrate on a flat spot on the wall.
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As you approach a stud, the lower LED lights will begin to track upward.
The manual stresses that bad calibration = bad results. Follow these "Golden Rules": stanley fatmax stud finder 400 manual
The AC Detection feature runs automatically in the background during both regular and deep scans.
Equips a bright LED backlit screen, an auto-illuminating arrow pointer, and an audible signal to indicate target tracking.
The Stanley FatMax Stud Finder 400 is a compact and lightweight device that uses advanced technology to detect studs and other objects behind walls. Its ergonomic design and intuitive interface make it easy to use, even for those with limited experience. The device features: Usually caused by improper calibration
It shows a stud everywhere.
: Keep the device still until you hear a final beep or see the "READY" icon. Calibration typically takes 1–3 seconds. How to Find Studs Once calibrated, you can begin your scan.
Overview: The Stanley FatMax Stud Finder 400 is a compact, user-friendly electronic stud locator designed for reliably finding wood and metal studs, plus live AC wiring behind walls. It’s ideal for hanging shelves, TVs, cabinets, and for general renovation tasks. This link or copies made by others cannot be deleted
The Stanley FatMax S400 requires a pristine power supply to accurately analyze dielectric constants behind wall surfaces.
Ideal for standard 1/2-inch or 5/8-inch drywall.
For higher accuracy, scan from the opposite direction to find the other edge of the stud.
Identifies the edge of the stud rather than the center.