AVO is a widely recognized historic brand specializing in precision electrical measuring instruments, valve testers, and the iconic Avometer.
AVO Ltd, originally based in London, is a legendary name in the history of electrical testing and measurement. The brand is most famous for the invention and production of the Avometer, a robust and versatile multimeter that became an industry standard for decades. Alongside the Avometer, AVO manufactured a range of specialized laboratory and field test equipment, including valve testers, transistor analysers, and signal generators.
Known for their high accuracy, durability, and comprehensive overload protection, AVO instruments have been a staple in research laboratories, military applications, and professional electronics workshops worldwide. Today, vintage AVO equipment is highly sought after by collectors and electronics enthusiasts for its exceptional build quality and vast historical significance.
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The Avometer is a versatile, multi-range electrical measuring instrument (multimeter) created by AVO Ltd, capable of measuring AC/DC current, voltage, ati resistance.
Calibration procedures and specifications for AVO equipment, like the VCM163 or original Valve Testers, can be found in their respective service and instruction manuals available on this page.
The original AVO mechanical multimeters are no longer manufactured under the AVO name. The brand and its technologies historically became part of the Megger Group, which continues to manufacture modern test equipment.
Many AvoMeters include a built-in battery check procedure or specific resistance zeroing sequence to verify battery health. Check your specific model's manual for detailed steps on setting the zero adjusters.