SBM-21 Geiger Counter Tube – Replacement For Beta Gamma Radiometers – NOS

This is a new old stock SBM-21 Geiger-Müller tube, used in beta and gamma radiation detectors.

It's a replacement for older units that might use the SBM-10 or similar.

Made by SBM, open box but unused.

If you're building or repairing a radiometer, this is the sensing element.

Classic Soviet-style component, still functional.

No MPN, just the model.

For hobbyists, preppers, or anyone into radiation detection.