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The Geiger counter (Dosimeter) was produced presumably since 1975 by the Leningrad Electrode plant. Designed to detect radioactive ionizing radiation and its intensity. External power supply - battery type "KBSL" - 4.5 V. Emitter - earpiece. The meter itself is powered by a voltage of 390 V through a converter. There is no other information about the device. Photo dosimeter provided Egorov Alexey, Divnomorsk, Krasnodar kr.