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CO2 Humidity and Temperature Data Logger

CO2 Humidity and Temperature Data Logger



Extech Logger Measuring Carbon Dioxide, Temp and RH with SD Card Part Number: SD800


  • Carbon Dioxide, Temperature and Humidity Measured and Recorded onto SD Card
  • 0 to 4,000 ppm (CO2), 0°C to 50°C (Temperature) and 10 to 90% (Humidity) Measurement Range
  • Stores up to 2 Million Readings Directly onto 2GB SD Card (No Software to Install)
  • Sampling Rate of 5 Seconds to 10 Minutes
  • LCD Display Shows Current Carbon Dioxide (CO2), Temperature and Humidity Readings


Carbon Dioxide Range: 0 to 4,000 ppm 
Resolution: 1 ppm 
Accuracy: ±40ppm (<1000ppm); ±5% of Rdg (>1000ppm)
Response Time:
Humidity Range: 10 to 90% RH 
Resolution: 0.1% RH 
Accuracy: ±4% RH
Temperature Range: 0°C to 50°C (32°F to 122°F)
Resolution: 0.1°C/F
Accuracy: ±0.8°C (±1.8°F)
Compensation: Automatic
Sampling Rate User Selectable
5, 10 and 30 Seconds
1, 2, 5 and 10 Minutes or Auto
Data Storage
2,000,000 Data Points on 2G SD Card
Display Type: LCD
Size: 60mm x 50mm (2.4" x 2.0")
Update Rate: Approx. 1 Second
Operating Environment Temperature: 0°C to 50°C
Humidity: 0 to 90% RH
Sensors Temperature: Internal
Humidity: Precision Capacitance Type
Carbon Dioxide: Non-Dispersive Infrared (NDIR) Sensor
Power Source AC Adapter and (6) AAA Battery for Backup
Note: The Batteries are Designed for only Backup. The Data Logger has Limited Functionality without AC Power.
Memory Card SD Memory Card 1 GB to 16GB Compatible
Battery Life Approx. 1 Month 
(Dependant on Environment and Sampling Rate)
Data Output MS Excel compatible file on SD Card
Standards Compliance CE
Weight Meter: 8.2 oz. (240 grams)
Probe: 5.4 oz. (158 grams)
Dimensions Meter: 132mm x 80mm x 32mm (5.2" x 3.1" x 1.3")
Probe: 132mm x 38mm x 32mm (5.2" x 1.5" x 1.3")