CO2 Monitor Air Quality Monitor for Carbon Dioxide Humidity Tempeture NDIR Sensor CO2 Meter Controller with Relay… Price: 129.99 (as of 11:45 EST- More info)

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Built-in Relay Function: Controls the ventilation system to automatically maintain the CO2 level that you set or specify
Measuring Range: CO2: 0~9999ppm ; Humidity: 0.0 ~ 99.9%; Temperature: -10.0 ~ 60.0 ° C (14 ~ 140 ° F)