
SBM-21 tube and test source assembly
thingiverse
This is an assembly space for the SBM-21 tube and a test source specifically designed for a random number generator project. As an alternative to a geiger counter, I opted for this kit available on eBay at http://www.ebay.com/itm/152348539563?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1555.l2649
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