If the lights are dim or the device fails to calibrate, replace the 9V battery. A weak battery is the most common cause of false "Live Wire" readings. For further visual guidance, you can view the official Stanley Tools Support page for digital copies of specific product inserts. wooden studs using this tool? How To Use a Stanley Stud Finder
The Stanley FatMax Stud Finder 400 is a versatile and reliable tool designed to help you locate studs, joists, and other wooden structures behind walls, ceilings, and floors. This manual will guide you through the proper use and operation of your FatMax Stud Finder 400, ensuring you get the most out of this valuable instrument. stanley fatmax stud finder 400 manual