... , including CO2,humidity and Temperature. Green House Analysing for CO2, O2, Temperature, Humidity, Application CO2 Monitoring Photosynthesis monitoringSpecifications Temperature 0°C~50°CHumidity ... Output Relay OutputAnalogue Output (0.8V~4V)Linear OutputRS-485 Independent IDMAX232 Half a year recordingHousing IP Degree IP65Other Function Button ...