INDUSTRIAL SCIENTIFIC, Nitrogen Dioxide, 0 to 150 ppm, Single Gas Detector - 8EFM0|18100060-4 - Grainger
Portable Nitrogen Dioxide Detector 0-20PPM Range LCD Display Backlit Rechargeable Li-battery Powered Three Alarm Way Digital NO2 Gas Monitor Meter Tester Analyzer with Sampling Pump - - Amazon.com
Handheld Nitrogen Dioxide (NO2) Gas Detector, 0 to 20/50/100 ppm | sisco.com