These precisely designed detectors can immediately respond to metal studs and fasteners behind gypsum boards and wooden surfaces. This series includes four different probe columns that do not require batteries or calibration, making them reliable to use simply - just slide through the wall surface and let the magnetic attraction guide you to the precise stud position. For DIY enthusiasts and professional installers, these compact tools can be easily installed in any toolbox and provide consistent and accurate results without damaging the walls.