Real-time data logger with integrated SD memory card measures/records oxygen, carbon dioxide, carbon monoxide, temperature and humidity. REED R9910SD Offers The R9910SD is capable of recording readings from 3 probes simultaneously and features Data hold, Max/Min functions, and an easy-to-read backlit LCD display. Using a SD card (max 16GB), a user can manually record up to 99 readings or automatically by selecting a desired sampling rate from 1 sec to 8 hours. Quickly generate an Excel file with raw data, all without the use of software. Optional accessories include a tripod and AC adapter for continuous long-term monitoring. Features Measures oxygen (O2), carbon dioxide (CO2), 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 integrated SD memory card User selectable sampling rate from 2 secs to 8 hrs Easy-to-read backlit LCD display Tripod mount for long-term monitoring Low battery indicator and auto shut off Included Data Logging Air Quality Meter Humidity Probe Carbon Monoxide Probe Carbon Dioxide Probe Oxygen Probe Hard Carrying Case Batteries