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The First Responder gas detector provides gas detection for first call and emergency response technicians in the gas utilities. It can be used as a Combustible Gas Indicator with LEL and % Volume ranges for leak detection and general safety monitoring. The First Responder combination gas detector also features a parts per million (PPM) range for increased sensitivity and rapid response for smaller leaks such as fitting leaks. Additionally, the First Responder has a Carbon Monoxide range for internal atmosphere monitoring where odor call response is required.