Russian Dosimeter Copris & M One tube SBM-20 Measures Gamma & Beta radiation - Use Gas Mantle (Thorium) Year production 1991 Green color 0.1 - 0.6 µSv/h Yellow color - 0.6 - 1.2 µSv/h Red color - 1.2 - 2.8 µSv/h
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