PANGAEA Digital Gas Detector, Portable Gas Tester Detector, Bright LED Screen, Natural Gas (Methane) or LPG (Liquified Propane Gas), Combustible Gas Sensor Sniffer (Natural Gas/Methane Model) - - Amazon.com
423-8351: Sensor-Temperature | Cat® Parts Store
Berkley High School to discourage vaping with detectors in restrooms – The Oakland Press
New technique for making wearable sensors allows faster and less costly prototyping of designs