To avoid the potentially lethal risk of drilling into concealed mains wiring etc pipe work, a voltage and metal detector is an absolute necessity. Our superb  new 3-in-i Detector performs both these functions 97 and more. With the flick of a switch you con also scan for wooden joists and studs beneath plaster,  enabling you to locate solid fixing points for shelves and pictures. When metal objects, voltage power supplies,  wooden joist or studs are detected, the LED corresponding to the appropriate picture lights up and en alarm sounda Measures approx r x 194 x P. Uses 
9V battery (not supplied).