Bosch Blue Multi Wall Scanner, a professional tool for detecting wood studs, metal objects including rebar, studs, steel & copper pipes, and live wiring. With the latest three sensor technology, it offers a wide range of detection performance up to 4-3/4", 121 mm deep in cured concrete. The scanner has 3 selection modes: wood, metal, AC wiring, and automatic calibration for easy & precise detection. The illuminated graphical LED display indicates mode, detection & strength, while the audible detection signal with on/off button provides additional convenience. The scanner includes (1) hand strap, (1) 9 volt battery, and has an operating temperature of 14 to 122 degree F. With an accuracy of 1/16 inch and a detection range of 2 inch, this Bosch wall scanner is a reliable tool for any professional or DIY enthusiast.