Before we had digital multimeters, the AVO meter was the Rolls Royce of measuring instruments. They are now quite sought after
The battery terminals, often a source of problems are clean and the movement is completely free. Tests on a couple of batteries suggest that it is still very accurate.
£30 or offer.
TELEQUIPMENT D54 OSCILLOSCOPE
A piece of G3WGV history, I bought this lovely little oscilloscope when I was about 19 years old. I think it cost me about 2 months' wages! Fully solid state apart from the tube, it was one of the first of the Telequipment 'scopes built after the company was taken over by Tektronix.
Make me an offer. Maybe free to a deserving cause.
PICOSCOPE ADC212/100 OSCILLOSCOPE
Picoscope makes digital oscilloscopes that work with your PC. This particular model is dual channel, 100MHz bandwidth and dates back to 2001. Picoscopes are highly regarded and ridiculously expensive!
The PC interface is a standard printer parallel port. These are getting rather less common these days but various reports suggest that the StarTech EC1PECPS parallel adapter works and there is still full documentation on the PicoScope web site.
£100 or offer.