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.
: If there is no "R," contact Stanley Customer Support at 1-866-215-1132 for a replacement. Tips for Accuracy How To Use a Stanley Stud Finder stanley fatmax stud finder 400 manual verified
: Open the battery cover. If you see a date code starting with "R" , your unit is not defective. Tips for Accuracy How To Use a Stanley
Place the unit in a vertical position, parallel to doors or windows. Install a fresh 9V battery
Install a fresh 9V battery. The manual is strict on this: “Do not use rechargeable 9V batteries as they provide inconsistent voltage.”
This article is an independent, verified user guide. Not affiliated with Stanley Black & Decker. Always cross-reference with the official product manual for your specific manufacturing run.
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