Accurate location and safe drilling indoors with the SAFETY-FIXX 3 in 1 location device. Before each drilling, you should make sure that there are no hidden power cables, metal or wooden beams behind the surface to be drilled.With a simple calibration on the surface to be drilled, live lines, metals up to a maximum depth of 38 mm and wooden beams in plasterboard up to 18 mm can be detected with a flick of the hand. The positions are indicated by the lighting of the LEDs and an acoustic signal. With a simple stroke of the hand over the area to be drilled, the beginning of the space is marked with the positioning aid. The light emitting diodes turn off continuing and returning the end of the position is marked. The find point is in the middle of the two marks. Measuring accuracy +/- 3 mm, including 9 volt alkaline battery, dimensions 15.5 × 6.5 cm.