The stanley intelli tools stud sensor 300 uses one pass centre find technology to locate edges of studs joists or live ac wires through drywall or other common building materials once the edge of the stud has been detected the stud sensor 300 displays red leds and sounds an audible tone it has a v shaped marking channel with an led that allows for accurate marking it can perform a deep metal scan of up to 75mm 3in the sesnsor has a backlit lcd screen that is ideal for low light conditions and a