Voltcraft lsg 4 test leads measurement device voltcraft lsg 4 dmm p the voltcraft lsg 4 uses a high frequency tone generator which modulates a hf signal on the test cable it also includes a highly sensitive inductive receiver which can detect cables up to 15cm inside a wall this allows you to track cable layouts precisely p p the signal of the sound generator can be fed alternatively via a rj11 connector or via an alligator clip in the conductor that has to be measured furthermore t