Stanley S160 Stud SensorFeatures The Stanley S160 Stud Sensor detects wood studs up to 25mm in depth and metal studs up to 38mm in depth It also detects the presence of AC live wire within a 15 45cm radius and up to 50mm depth Single button for simple operation An audible alert provides clear notification of stud detection whilst directional LED lights provide visual guidance to stud location. Auto calibration helps to avoid missed studs due to incorrect initial calibration