Geiger Muller Tube Counter SBM-20 / SBM20 / СБМ-20 (an. STS-5, SI22G, M4011, J304) for ionizing radiation detection. Can detect beta and gamma radiation. 400 V operating voltage. 105 mm overall length. Gold (brass) color. Symmetric end caps. Positive terminal is usually marked ‘+’, but if not, it’s the end closest to the "CBM-20" marking.
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