SI-8B CI-8B 8 Geiger Mica counter GM tube for dosimeter ussr TESTED 100% NEW. SOFT BETA and GAMMA GM DETECTOR TUBES. Vintage Made in USSR during the 80’s for the Soviet Military Needs. Genuine Russian Military Surplus. Condition – NOS, Never Used, Comes straight from the Factory Box. Plateau Inclination 0.3%/V. Working current 18.2 mA. […]