Fatmax Stud Finder 400 Manual Verified ((full)) - Stanley

A: That is normal. The sensor detects the sudden change in density (air vs. wall). The manual verifies this as a "release tone." It is not an error.

Let me know in the comments if you are still having trouble, and I can help troubleshoot your specific wall type! stanley fatmax stud finder 400 manual verified

Even pros run into issues. Here is the official troubleshooting guide for the 400 model. A: That is normal

The Stanley FatMax 400 isn't a "point and shoot" device. It uses electronic signals to detect density changes behind your walls. If you don’t calibrate it correctly in "Air" mode first, you are going to get erratic readings every single time. The manual verifies this as a "release tone

: Press and hold the Activation Button on the side. The LCD will display "CALIBRATING" and then "READY" after 1–3 seconds.