Nuclear Radiation Detector GQ GMC-800 Geiger Counter USA Design Product US National Standard Large Color LCD Display 5 Alarm Types Dosimeter Data Save & Global Share Beta Gamma X-ray Portable Device

Geiger counter, because. https://a.co/d/05VjbrkY

Thank you for the information. Yes. It means they're radioactive. I keep a Geiger Counter with me to be sure they are radioactive. I collect uranium glass and radium dials like watches, clocks, and large equipment instruments