Amperevoltommeter `` Ts-20 ''.

Instruments for adjusting and controlling the PTA.Amperevoltommeter "Ts-20" from the beginning of 1955 produced the Omsk plant "Electrotochpribor". The combined device "Ts-20" is designed to measure the magnitude of AC and DC voltages, amperage and resistance. For more than 30 years of production, the device has not undergone significant changes, with the exception of replacing its element base with a more modern one, and a black carbolite case with a plastic one with rounded or sharp corners, mostly of light shades. The device was also produced by other factories, which differed in control regulators, copper, nickel-plated or tinned sockets. The price of the device was constant at 19 rubles. The exception was the Ts-20 avometer produced in 1976, complete with a soldering iron, additional devices and solder.