Available as battery-operated, handheld device or in NEMA 4 enclosure, combination meter can display up to 100% methane (CH<sub>4</sub>) and 50% carbon dioxide (CO<sub>2</sub>) levels in real-time or be used as datalogger to record gas levels over time. Both versions, which leverage non-dispersive infrared (NDIR) sensor that does not require frequent calibration, use built-in micro-pump to take sample via tube port, measure sample, and return it via second tube port to form closed-loop system.
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