Norge 3-in-1 Stud Detector
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Q:can this detect accurately through brick or cement?
A:- Detects metal pipes up to 1-1/2", detects wood and metal studs up to 3/4"
Q:what is the minimum voltage this can detect?
A:This tool is for detecting metal / wires that are hidden in the wall. You could still find the wire even the power is off.