Thin mica window detects alpha, beta, and gamma radiation. Operating range is 450-600 volts, the recommended voltage is 500 volts. Recommended anode resistor: 10 megaohms. Gas filling. Neon and halogen. Measures .36" (9.1 mm) wide, 1.6" (40 mm) long.

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Small GM Tube detects beta and gamma radiation. Operating range is 450-650 volts, the recommended voltage is 500 volts. Recommended anode resistor: 3.3 megaohms. Gas filling. Neon and halogen. Measures .19" (4.83 mm) wide, .63" (15.9 mm) long. Not for detecting alpha radiation. Beta and Gamma Only. For Alpha radiation detection use the GMT-01.

Small GM Tube detects beta and gamma radiation. Operating range is 350-475 volts, the recommended voltage is 400 volts. Recommended anode resistor: 5.1 megaohms. Gas filling - Neon, Argon and Bromine. Measures 11 mm in diameter by 101 mm long. Not for detecting alpha radiation. Beta and Gamma Only. For Alpha radiation detection use the GMT-01.

Small GM Tube detects beta and gamma radiation. Operating range is 370-480 volts, the recommended voltage is 400 volts. Recommended anode resistor: 3.3 megaohms. Gas filling. Neon and halogen. Measures 6mm in diameter by 35mm long. Not for detecting alpha radiation. Beta and Gamma Only. For Alpha radiation detection use the GMT-01.