Ideal for detecting cables, pipes & wall studs, this incredibly useful tester combines metal, voltage & stud detection into one handy tool. It is compact & lightweight enough to carry in your toolbox so it can be used readily to detect the location of electricity cables, metal pipes or metal studs. How it works You set the detector to your choice of either 'metal', 'stud' or 'AC'. Run it across the relevant work area, & a series of ascending bars will show up on the LCD display as you get closer to & find the mode. The light awareness is accompanied with a beeping sound when the relevant search is detected. Metal Stud Detection If wall studs or battens are found, the red LED lights up & an audible sound alerts you from one edge of the batten. When the other extremity is located the green LED lights up & a lower pitched audible sound will be heard. Electricity Detection When electricity is found the red LED flashes & the sound will be intermittent. Dimensions Size 65 x 135mm. Powered by a PP3 size battery (sold separately) Draper Founded in 1919, Draper produce high quality award winning tools that are particularly credited with their reliability & innovation. This handy versatile tool is excellent value for your money. It comes to you display packed with a detailed instruction leaflet enclosed.