GQ GMC-300 Geiger Counter Overview and Demo - YouTube
Why do I get spikes of radioactivity when I bring the geiger counter close to the walls of my house? Is it possible that reinforced concrete contains radioactive elements? : r/Radiation
Electronics - The GQ GMC 320+ Geiger counter and linux support - YouTube
GMC 320 Plus Geiger Counter
GQ GMC-320Plus Fulfill Nuclear Radiation Detector Meter Test Equipment: Amazon.com: Industrial & Scientific