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These interesting glass Geiger tubes type, DOB-50, were made in Poland during the Cold War. They operate on 390-490V, the plateau length is 50V, and they detect beta and gamma radiation. Size 70mm long x 10mm diameter. Even though these are new in a box, we test each one to make sure that it is perfect. Here in Arizona, the background click from this is one or two counts per minute.
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