Check the listing for details. REED SD-9901 Data Logging Indoor Air Quality Meter *DEMO UNIT*. Condition: Used. Listed at 649.99 USD. REED SD-9901 Data Logging Indoor Air Quality Meter *DEMO UNIT* Real-time data logger with integrated SD memory card (optional) measures/records oxygen, carbon dioxide, carbon monoxide, temperature and humidity. REED SD-9901 OffersThis indoor air quality (IAQ) datalogger measures Oxygen, Carbon Dioxide, Carbon Monoxide, Temperature and Humidity. The SD-9901 is capable of recording readings from 3 probes simultaneously and displays measurements on a large backlit LCD. Using a SD card (max 16Gb), a user can select a desired sampling rate and quickly generate an Excel file on a SD card without the use of software. Optional accessories include a tripod and AC adapter for continuous long-term monitoring. Optional PC software also allows a user to track live measurements. Features:Measures oxygen (O2), carbon dioxide (CO2), carbon monoxide(CO), temperature and humidityRecords up to 3 readings simultaneouslyUser adjustable audible alarmsUser selectable unit of measure (°F or °C)Data hold and Max/Min functionsReal-time datalogger with integral SD memory cardUser selectable sampling rate from 2 secs to 8 hrsEasy-to-read backlit LCD displayOptional PC software features live tracking via USB connectionLow battery indicator and auto shut off REED SD-9901 SpecificationsTemperatureMeasuring Ranges32 to 122.0°F (0 to 50.0°C) Dew Point: -13.5 to 120.1°F (-25.3 to 48.9°C) Wet Bulb: -6.9 to 122.1°F (-21.6 to 50°C) Accuracy±1.5°F (±0.8°C)Resolution0.1°F/°CHumidityMeasuring Range5 - 95% RHAccuracy>70%RH: ±(3% rdg + 1%RH) 1,000 ppm: ±5% Rdg Resolution1 ppmCOMeasuring Range0 to 1,000 ppmAccuracy±(5% + 2 ppm)Resolution1 ppmO2Measuring Range0 - 30% O2Accuracy±(1% + 0.2% O2)Resolution0.10%General SpecificationsAlarm Threshold