... ,CO2 continuously 3. Alarm point PGAS-24 CO2 & O2 Gas Detector for GreenhouseBrief introductionPGas-24 Portable 2 in 1 Gas Detector, can ... button7) Swith8) SensorNote: this figure is based on model PGas-24-O2/CO2 Main featureAble to detect O2,CO2 continuouslyDisplay O2 ...