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Used by technical and rebreather divers, the Nuvair Pro Trimix Alarm analyzers measure helium (He) and oxygen (O2) levels in mixed breathing gases stored in gas cylinders or from the continuous flow of gas from a compressor. The Analyzers are compatible with outdoor and marine environments, are self-calibrating and include audible and visual alarms for user defined set points. Range: 0-100% with display accuracy of ±2%. As an option, the analyzers can shutdown a compressor by way of analog output at a user-defined set point.