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Smart Sensor NO2 Gas Detector — Handheld Nitrogen Dioxide, 0-20 ppm non-vented and MCR Safety compare head-to-headEDITORIAL REVIEW: 4. 1 5 WC Safety Review of the Smart Sensor NO2 Gas Detector, a handheld nitrogen dioxide monitor. Editorial assessment by Steven Eaton, WC Safety editor, based on published Smart Sensor specifications and category fit. We did not laboratory test this product. The Smart Sensor NO2 Gas Detector is a handheld, rechargeable single gas nitrogen dioxide monitor reading 0 20 ppm on an LCD, with audible, visual and vibration alarms, for