The analogue Martindale Fuse Finder Kit (FD500) finds which fuse or breaker controls a circuit. It also enables tracing from socket to socket on a circuit.

The transmitter (FD500/T) takes its power from the mains and emits a signal which the adjustable sensitivity receiver (FD500/R) can pick up.

This combination can easily distinguish the appropriate circuit, even on a crowded fuse board.

Sensitive analogue adjustment by thumb wheel finds the right breaker rapidly.