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Ampervoltmeter "Ts-437" was produced since 1964.
An ampervoltmeter is a combined device designed to measure current and voltage in direct current circuits, direct current resistance, effective effective value of the sinusoidal voltage in alternating current circuits with a frequency of 45 to 40,000 Hz.
The device is intended for use in the operation of electronic equipment and communications, as well as radio amateurs.
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