Avo

[technoguy]

The Avometer was a British brand multimeter (USA). It was often called an AVO and derived its name from the first letter of the words amperes, volts, ohms. It was by far the best instrument of its kind in the UK from the 1930s to at least the 1960s. Almost uniquely for a radio repairman's multimeter it measured alternating current up to 10 A as well as the standard AC and DC voltages up to 1000 V; as an ohmeter it measured from 0.1 Ω up to 200 kΩ in three ranges. The instrument had an accuracy of ±1% of FSD on DC ranges and ±2% on AC ranges.