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> 21 mm geiger mueller tube radiation counter sbm 21
21 mm geiger mueller tube radiation counter sbm 21
old stock unused 21 mm GEIGER MUELLER TUBE RADIATION Counter SBM 21
This GM tube for beta-rays is from Russia. It is unused, from old stocks.
Range of measurement is from 40 microroentgen per second to 400 microroentgen per second. The range of a working voltage is 350-475 v. This is small tube. Diameter is 6mm, lenght is 21mm.Similar tubes can be used in Geiger Counter wristwatches.
