Avometer

Avo
AVOmeter is a British trademark for a line of multimeters and electrical measuring instruments; the brand is now owned by the Megger Group Limited.wikipedia
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Multimeter

digital multimeterdigital multimetersDMM
AVOmeter is a British trademark for a line of multimeters and electrical measuring instruments; the brand is now owned by the Megger Group Limited.
Macadie invented an instrument which could measure amperes (amps), volts and ohms, so the multifunctional meter was then named Avometer.

Megger Group Limited

MeggerAVOEvershed & Vignoles Ltd
AVOmeter is a British trademark for a line of multimeters and electrical measuring instruments; the brand is now owned by the Megger Group Limited.

Ebonite

hard rubbervulcaniteEbonite rubber
The case of the original AVOmeter was a comb-jointed oak box with an ebonite lower front panel.

Full scale

Full scale deflectionFSDfull system scale
The instrument has an accuracy of ±1% of FSD on DC current ranges, ±2% of FSD on DC voltage ranges, ±2.25% of FSD on all AC ranges and ±5% of reading (at centre scale only) on resistance ranges.

Vacuum tube

vacuum tubestubethermionic valve
The Automatic Coil Winder & Electrical Equipment Co. Ltd. made many other types of instruments, including a line of valve (vacuum tube) testers.

Bowes Park

*Donald MacCadie, inventor of the AVOmeter, lived at 190 Bowes Road at the corner of Moffat Road.