Always scan in both directions (left-to-right, then right-to-left). The point where the Red light triggers from both directions is the exact center of the stud.
The official manual states that the unit must be placed directly over a stud, dense material such as metal, or over a wet or newly painted area during calibration, as this will prevent it from calibrating correctly. Additionally, the sensor will not detect objects in concrete, mortar, block or brick work, carpeting, foil-faced materials, metallic surfaces, or ceramic tiles. It is also not designed to locate non-ferrous or plastic objects such as pipes. stanley fatmax stud finder 400 manual verified
For the most accurate results, follow this exact operational sequence. 1. Position the Unit Additionally, the sensor will not detect objects in
Because the FatMax 400 is magnetic, it does not use a typical "calibration" button found on electronic models. Instead, follow these physical scanning steps: : Hold the unit flat against the wall surface. block or brick work