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72-2120-401-3K Digester gas monitor, 100% volume CH4 / 25% volume O2 / 50% volume CO2 / 3,000 ppm H2S |
72-2120-401-3K Digester gas monitor, 100% volume CH4 / 25% volume O2 / 50% volume CO2 / 3,000 ppm H2S |