1. In a secure location, a microphone can assist with hole drilling.

Drilling holes close to sockets or switches carries the danger of breaking a wire. Fortunately, there's a novel method for locating concealed cables within walls. A tape recorder can be used by connecting a microphone to it and setting it to record at maximum volume. Position the microphone close to the planned wall opening. The dynamics of the tape recorder will cause a faint hum in the areas where concealed wires are present. Drilling can be safely conducted in areas devoid of humming noise.
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