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Pocket Geiger: The $46 iPhone Geiger counter
Jd-3001 Multifunctional Geiger Counter And Electromagnetic Radiation Detector Temperature And Humidity Measurement Device With Data Export Function - Walmart.com
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Autoranging Radiation Monitor / Geiger Counter – Sper Scientific Direct
Amazon.com: Phone Case Radioactive Geiger Counter Compatible with iPhone 6 6s 7 8 X Xs Xr 11 12 Pro Max Mini Se 2020 Scratch Waterproof Transparent : Cell Phones & Accessories