indoor air quality monitor and controller ( temperature meter. humidity meter . CO2 meter.VOC meter) Duct mount( ... Probe separable if you need, please remark, indoor air monitor controller ... Dual window NDIRCorrespod timeCO2 :,(T90) <60s; Temperature and humidity: 1/e(63%)change ,Slow flow rates<10sVOC: 20m2 indoor, for 10ppm ethanol ...