Finder 400 Manual Verified — Stanley Fatmax Stud
The FatMax Stud Sensor 400 is a hand-held device that uses electronic signals to scan through drywall and other common building materials. It helps you accurately locate the edges and center of studs, joists, and even live AC wires behind walls, allowing you to drill and screw with confidence.
A: Yes. The device features a dedicated AC TRACKING mode . When the tool approaches a live AC wire, a red LED will illuminate and an audible warning will sound.
To activate the dedicated mode:
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Provides clear visual feedback on the tool's readings, even in low-light environments.
You’re calibrated. Now, how do you actually find the stud?
The will illuminate and an audible tone will sound when you reach the exact center. The FatMax Stud Sensor 400 is a hand-held
A: The original 400 model has been superseded by the FatMax 500 and 700 in some regions, but the 400 is still widely available and supported. The verified manual remains active on Stanley’s support site as of 2025.
the activation button. A series of tones will sound, and the "Ready" icon will appear on the LCD once calibration is complete (usually 1–3 seconds).
Place the unit flat against the wall in a vertical position. The device features a dedicated AC TRACKING mode
| Problem | Possible Cause | Verified Solution | | :--- | :--- | :--- | | | Dead or incorrectly installed battery. | Replace with a new 9V alkaline battery. Ensure it is properly connected to the terminal clip. | | Calibration fails (continuous beep / flashing lights) | Starting calibration over a stud, dense material, or wet paint. | Move the unit to a different location on the wall that is a “blank” area with no studs or pipes. Repeat the calibration process. | | The sensor beeps constantly on the wall | The sensor is too close to a dense material or is not placed flat. | Ensure the sensor is held completely flat against the wall. Make sure you are not holding the sensor over a stud or conduit. | | No beep or indicator when moving over a known stud | The wall material is too thick, or the battery is low. | Check the maximum scan depth of 1½". If the wall is thicker, the sensor may not detect the stud. Replace the battery and re-calibrate. | | Inconsistent/Unreliable results | User error or improper calibration. | Repeat the calibration sequence in a fresh location. Ensure your free hand is at least 6 inches from the sensor to avoid interference. | | No beep when scanning, only a red LED after calibration | The unit may be faulty or the battery voltage is too low. | Replace the battery and recalibrate. If the issue persists, it may be a defective unit. |
: Always find at least two fasteners vertically to ensure you aren't just hitting a random stray nail.