Hamamatsu D3517 micro geiger mueller halogen-quenched tube for geiger counters is one of the tiniest tubes made. Size of tube is only 0.20" diameter x 0.70" long (excluding anode pin). Operates on 400VDC to 600VDC and will work with our C8600
Ultimate Geiger Counter Kit that we sell. Detects beta and gamma rays. This is one of the smallest GM tubes we have seen! New-old stock. Each tube is 100% tested.