![GCA-07W-C Professional Digital Geiger Counter - Radiation Monitor - with External Wand - ANSI Certification Ready- 0.001 mR/hr Resolution - 350 mR/hr Range: Amazon.com: Industrial & Scientific GCA-07W-C Professional Digital Geiger Counter - Radiation Monitor - with External Wand - ANSI Certification Ready- 0.001 mR/hr Resolution - 350 mR/hr Range: Amazon.com: Industrial & Scientific](https://m.media-amazon.com/images/I/6107H8u2HqL.jpg)
GCA-07W-C Professional Digital Geiger Counter - Radiation Monitor - with External Wand - ANSI Certification Ready- 0.001 mR/hr Resolution - 350 mR/hr Range: Amazon.com: Industrial & Scientific
![GCA-08W Professional Digital Geiger Counter Radiation Monitor with External Wand - NRC Certification Ready- 0.001 mR/hr Resolution - 1000 mR/hr Range: Amazon.com: Industrial & Scientific GCA-08W Professional Digital Geiger Counter Radiation Monitor with External Wand - NRC Certification Ready- 0.001 mR/hr Resolution - 1000 mR/hr Range: Amazon.com: Industrial & Scientific](https://m.media-amazon.com/images/I/717QJiRvXCL.jpg)
GCA-08W Professional Digital Geiger Counter Radiation Monitor with External Wand - NRC Certification Ready- 0.001 mR/hr Resolution - 1000 mR/hr Range: Amazon.com: Industrial & Scientific
![Calibrating Geiger Counters with an Analog scale (Ludlum anyone?) for accurate CPM rate reading using a Function Generator. This method calibrates the electronics only and doesn't account for detector efficiency and actual Calibrating Geiger Counters with an Analog scale (Ludlum anyone?) for accurate CPM rate reading using a Function Generator. This method calibrates the electronics only and doesn't account for detector efficiency and actual](https://preview.redd.it/bznpyf1kd4i61.jpg?width=640&crop=smart&auto=webp&s=52976aca138657e5a3775a5c7edb329ad061300a)