3825  Instruments for Measuring & Testing of Electricity & Electrical
Signals

Establishments primarily engaged in manufacturing instruments for measuring
the characteristics of electricity and electrical signals, such as
voltmeters, ammeters, wattmeters, watt-hour meters, demand meters, and
equipment for testing the electrical characteristics of electrical, radio,
and communication circuits and of internal combustion engines.
Establishments primarily engaged in the manufacturing of electronic
checkout, monitoring, evaluating, and other electronic support equipment
for electronic navigational, radar, and sonar systems are classified in
industry 3812, and those manufacturing similar equipment for communications
systems classified in industry group 366.