Ch3-68 (Chastotomer elektronno-schetnyj) 1989
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Frequency counters electronically counted "Ch3-68" and "Ch3-69" were produced since 1989 by the Abovyan plant "Meter". Frequency meters are designed to measure a sinusoidal and pulse frequency and provide a reference frequency signal. More details about the devices in the instruction manual. ,null,ru,null,null,null,null
Documentation:
Information from collection of Valery Khartchenko