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Reed Instruments - Test and Measurement Equipment


REED SD-9901
Indoor Air Quality (IAQ) Meter Datalogger

REED SD-9901 IAQ Datalogger with date/time stamp stores measurements on SD memory card without the need for software.

This 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.


  • Measures CO2, CO, O2, Humidity and Temperature
  • Non-dispersive infrared CO2 sensor
  • Galvanic cell CO and O2 sensors
  • Precision capacitance humidity sensor
  • Includes humidity probe, CO probe, CO2 probe, O2 probe, and hard carrying case
  • Records readings from 3 probes simultaneously
  • Audible alarm setpoint
  • Temperature is measured in °C or °F
  • Easy to read LCD with backlight
  • Data hold and Max/Min record
  • Real time data logger with integral SD memory card (OPTIONAL)
  • Just plug the SD card into the computer and it downloads directly to EXCEL
  • RS-232 and USB computer interface
  • Auto or manual power off
  • NIST Traceable Certification Available


  • CO2 Range: 0 to 4,000 ppm
      Resolution: 1 ppm
      Accuracy: ±40 ppm (<1,000 ppm), ±5% (>1,000 ppm
  • CO Range: 0 to 1,000 ppm
      Resolution: 1 ppm
      Accuracy: ±(5% + 2 ppm)
  • O2 Range: 0 � 30% O2
      Resolution: 0.1% O2
      Accuracy: ±(1% + 0.2% O2)
  • Alarm Threshold: <18.0% O2
  • Humidity Range: 5 to 95% RH
      Resolution: 0.1% RH
      Accuracy: >70%RH: ±(3% rdg + 1%RH);
      <70%RH: ±3%RH
  • Temperature Range: 0 to 50.0°C (32 to 122.0°F)
      Resolution: 0.1°C/°F
      Accuracy: ±0.8°C (±1.5°F)
  • Dew Point Temp. Range: -25.3 to 48.9°C (-13.5 to 120.1°F)
  • Wet Bulb Temp. Range: -21.6 to 50°C (-6.9 to 122.1°F)
  • Power Supply: 6 x 1.5V UM3/AA batteries
  • Dimensions: 7 x 2.7 x 1.8 in;
      RH Probe: 7.8 in L;
      CO & O2 Probe: 5.9 x 1.5 x 1.5 in;
      CO2 Probe: 7.5 x 1.5 x 1.1 in
  • Weight: 12.35 oz.

REED SD-9901 Indoor Air Quality (IAQ) Meter Datalogger

Spec Sheet (PDF)


SD-9901 IAQ Meter/Datalogger


REED SD-9901 Indoor Air Quality (IAQ) Meter Datalogger


SD-9901 IAQ Meter Datalogger w/ NIST


REED SD-9901 Indoor Air Quality (IAQ) Meter Datalogger w/ NIST

NIST Traceable Certification Available

NIST Traceable Certification Available - (Optional)

Note: NIST Certification may delay shipment by 1 - 3 Days

Orders over $300 ship FREE to 48 States

Optional Accessories:


 Optional 4GB SD Memory Card

Optional SD Card

AC Adapter (110V)


110V AC Adapter

USB Adapter Cable


USB-01 Cable

PC Software


8 Channel Windows Compatible Software

Orders over $300 ship FREE to 48 States

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