This unit is a 3 in1 metal/voltage/stud detector. It uses electronic signals to locate the exact position of studs, ceiling joist AC wires and metal though drywall , concrete and other common wall materials .once the edge of a stud has been detected, it emits audio and visual signals (LCD dispaly ) that allow you to easily pinpoint its center position. This unit is an ideal tool for DIY fans, professional electrician and users in decoration filed.   Place the instrument on the surface of the object to be tested, press the power switch next to it for 2 seconds, press the middle selection button to select the type of object to be measured, press the power button to sample, and make a “drop” sound, indicating successful sampling.   Function description   Three model selection Find wood and metal stud Find AC wires, pipes and joints Hand grips for ergonomic comfort Low battery indication Front pointer for easy marking of stud edges   Specification   Battery power : 6F 22 9V battery Battery Life: 1 year with normal use Stud detecting depth: 19.05mm (3/4 inches) behind wall Shell Material: ABS Metal detecting depth: 38.10mm (1 1/2 inches) Size: 155(L))*28(H)*75(W) mm/6.25inch x 1.92 inch x 2.95inch Weight: about 203g(including battery)/ 7 ounces
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