USB Datalogging Wall Mount Desktop VOC Temperature RH Humidity Logger 0~50ppm VOC Range :0~50ppm Logging Memory : 32000 Air Contaminant :VOC (Hydrogen sulfide, Ammonia, Ethanol, Toluene, Smoke) Logger mode : Key start/stop / Immediately / Schedule / Real-time / Roll-over Display Content : VOC, Temperature, RH%, Date and Time