Re: AVO Multimeter survey
Andy,
Did your archive research reveal any information on the Mk 1 Protometer, especially circuit information?
I don't think I've seen a Mk 2 (Multiminor based) Protimeter, but I do have two other variants on the Multiminor theme: the International Rectifier/AVO Zener Diode Selector and what seems to be a temperature indicator labelled "Aeration Systems (NCH) Ltd.
The Zener Diode selectors have serial numbers 161-763 and 233-763. I'll start another thread on Multiminor based special instruments when I get some time.
PMM
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