This is a real AVO Model 8. AVO used to be a respected British manufacturer of electronic instruments. They are now part of the Megger-AVO company. Their range of multimeters was known for their robustness, precision and reliability.

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The AVO model 8 is a very good instrument. In the time it was introduced, its 37.5 μA meter movement made it an exceptionally sensitive instrument.

In march 2007 I bought this AVO model 8 that looked very well. The price was low because the meter movement was defective. When I collected the meter, I had a very pleasant conversation with the seller who had worked with different types of AVO meters a lot, and who was pruning his collection of instruments. When I inspected the meter for the cause of the defect, I saw that the counterweights that balance the meter movement, had disappeared. After some fiddling, I was able to make some replacement weights and rebalance the meter. It is now working again. Although I should recallibrate it, it is already a nice instrument to have and use.

This is a real AVO Model 7. The AVO 7 was a robust instrument, manufactured in the 1950-ies by the British AVO company. Somewhere around 1982 I found this specimen on a flea market. I remember there was a label on it from the local electricity company. It was clear that the meter had been used heavily, because the lettering 'DC switch' and 'AC switch', engraved in the Bakelite case, had almost worn out.

I hoped that this was my chance to own and use one of those a legendary AVO meters and decided to accept its condition. Alas, when I inspected the instrument at home, I found it did not work. There were signs of numerous previous repairs and some of the resistors looked scorched. So this is a nice old instrument to look at, but nothing more. Anyway, the AVO model 7 uses a 1 mA meter movement, so for electronic measurements it generally loads the circuits too much. Universal AVO Minor The AVO Minor was a smaller and cheaper model than the large AVO 7, 8 and successors. It is a bit rarer, though. Download red alert 2 rip portable heaters.

The switch on the front is only to select between AC and DC volts while the actual range is set by plugging the test wire in the corresponding receptacle. It seems AVO also had an even more “minor” model without the AC/DC switch. The meter movement needs 2.5 mA, which is quite insensitive.

I bought this meter through the from a fellow collector in december 2012. I'm not sure about its age. The person selling it, said it was from 1935. Although simple, it seems a bit too sophisticated for 1935.

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A more recent specimen of the Universal AVO Minor discussed on the has the same type of case but a 1 mA movement. Anyway, the instructions on the aluminium back plate are in a type that could be 1930-ish. And the handwritten serial number looks ancient, too. I asked for a serial number key on same forum, and promptly received the answer that, by the serial number, my meter dates from 1946. Universal AVO Minor - back compartment I opened the aluminium back panel to look inside. This revealed a shallow compartment, apparently intended to tuck away the test leads.

The bottom of the compartment consisted of a piece of red impregnated fiberboard or cardboard, less than 0.5 mm thick. Took the lid off the battery cover. Found one leaky AA cell and a spring to make it fit (originally, a slightly larger and now unobtainable type of cell was used). I gladly removed that source of corrosion. I removed the screws that held the cardboard bottom but wasn't able to remove it. It seems to be sealed in place on two places where some kind of sealing wax can be seen in a hole with a screw underneath.

I don't want to break these seals, so I'll leave them for now. Unknown British meter This is a British made meter I bought on a flea market somewhere around 1980. It does not carry a recognisable brand. Judging by its construction (it has an off-the-shelf 1 mA meter movement and standard stock switches in a generic Bakelite box - no fancy custom case and meter) this must be one of a small series from a small workshop.