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GQ GMC-500+ Plus Geiger Counter Nuclear Radiation Detector Dosimeter Dual Tube Data Logging

TDS Meter Digital Accurate Water Quality Testing Tool for Aquariums, Pools, and Hydroponics Drinking Water, Aquariums, Hydroponics, 0-9990 ppm Measuring Range, 1 ppm Increments, 2% Readout Accuracy

Extech SL400 Personal Noise Dosimeter

ChromAir Ammonia Badge (Morphix Part# 380003-10, 10-Pack) and Strap Clips (Morphix Part# 401966-10, 10-Pack)

MEASALL Radiation Dosimeters and Gamma-Spectrometers KC761