Data Logging Indoor Air Quality MeterMeasures oxygen (O), carbon dioxide (CO), carbon monoxide (CO), temperature and humidity Records up to 3 readings simultaneously User adjustable audible alarms User selectable unit of measure (C or F) Data hold and max min functions Real time data logger with integral SD memory card User selectable sampling rate from 2 seconds to 8 hours Large, easy to read backlit LCD display Tripod mount for long term monitoring Low battery indicator and auto shut