Voltmeter `` VK7-9 ''.
Instruments for adjusting and controlling the PTA.Voltommeter "VK7-9" from the 1st quarter of 1967 produced the Tallinn plant "Punane RET" and Krasnodar spare parts. The voltommeter is designed to measure DC voltage from 0.1 to 500 V, AC voltage from 0.3 to 100 V in the range up to 700 MHz, up to 1000 V in the range up to 300 MHz, and for measuring resistances.
