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GCA-07W Professional Digital Geiger Counter - Radiation Monitor - with External Wand - NRC Certification Ready- 0.001 mR/hr Resolution - 1000 mR/hr Range: Science Lab Geiger Counters: Amazon.com: Industrial & Scientific
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Example of a Geiger counter is an instrument used for measuring ionizing radiation. Dated 21st Century Stock Photo - Alamy
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