What makes this unique is the casing detail. It is otherwise pretty unremarkable but still worth at least 60.
- Fact 1: The Geiger counter was invented by Hans Geiger in 1908.
- Fact 2: Geiger was a member of the "Uranium Club", a group which worked on an atomic bomb for Nazi Germany.
- Fact 3: French physicist Henri Becquerel won a Nobel Prize for his 1896 discovery of radioactivity.
- Fact 4: The modern form of the Geiger counter is called the "halogen counter", which has a lower operating voltage and a longer life.
- Fact 5: Geiger counters are used to measure nearby nuclear radiation, usually conveying that information by way of an audible "click."