Home-Built Radiac (Radiation Detector and Meter) for a Surplus DT-590A/PDR-56F Scintillation Probe – diy Physics Blog
DIY Geiger Counter, Easy to Assemble Compact Size PC Data Acquisition Nuclear Radiation Detector High Accuracy with USB Cable for Cosmetic Detecting: Amazon.com: Industrial & Scientific
Pocket radioactivity detector
DIY Assembled Geiger Counters Kit Geiger Counter Module Miller Tube GM Tube Nuclear Radiation Detector With Sound Light Alarm