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Specification: Measurement range: Co:0-100% C02:0-50% Ch4:0-10% H2:0-50% O2:0-25% Precision:co/co2/ch4/:2%, o2/h2:3%(fs) Resolution:0.01% Response time:less than 20s Warm up:10min Output: 4-20ma or rs232 3u size casing