Here is what Mike says…

‘FuzzOmeter.

1941 Marconi Volt/Ohm Meter fitted with a single knob Fuzz circuit.

Single volume control and fitted with a true bypass switch and LED.

This is a really rich, meaty sounding fuzz that works well for both single coil and humbucker pickups.

The Fuzz circuit is based around a single MPSA13 transistor and BAT41 diode combination. 

For those that may worry about me destroying a piece of early ’40s electrical testing equipment.. don't. No holes drilled in case, nothing that can't be removed and restored to original. So don't panic.’