GQ GMC-300S Digital Nuclear Radiation Detector Monitor Meter Geiger Counter Radiation Dosimeter: Amazon.com: Industrial & Scientific
GMC-500 Plus Geiger Counter Radiation Detector
Amazon.com: GQ GMC-500+ Plus Geiger Counter Nuclear Radiation Detector Dosimeter Dual Tube Data Logging : Industrial & Scientific
On Digital Geiger Counters - A quick comparison between GQ GMC-600+ and Radiation Alert Ranger. What is good and what is not so hot - details in the comments. : r/Radioactive_Rocks