Fantastic Continuity Tester.

[ppppenguin]

That's a useful idea. I have a different continuity tester that's handy when there are multiple circuits to be identified. One end is a 9V battery and bleeper. It can be used as an ordinary tester. The other end is the magic bit. I forget the circuit so would need to open it up but it's basically a bridge rectifier, capacitor and a couple of other bits. When connected to the tester it warbles instead of bleeps, hence showing that you're connected to the same pair of wires at each end. Because of my video background the connectors are BNC on each unit. Hence BNC to croc clip leads are needed for other purposes.