Extech SD800 CO2/Humidity/Temperature Datalogger with SD Card

The Extech SD800 is a multifunction air quality datalogger that simultaneously measures and records carbon dioxide (CO₂), relative humidity, and temperature. Designed for monitoring indoor air quality in schools, offices, hospitals, greenhouses, and other occupied spaces, it logs timestamped data directly to a 2 GB SD card in Excel®-compatible CSV format for easy transfer and analysis on a PC. With a user-selectable sampling interval from 5 seconds to 10 minutes (plus Auto mode), a triple LCD display, and long-term datalogging capability, the SD800 supports both battery and AC-powered operation. It includes a detachable sensor probe, 6 AAA batteries, universal AC adapter, 2 GB SD card, and mounting bracket. Note: AC adapter is required for continuous operation.

Features:

• Simultaneous display and logging of CO₂ (0–4000 ppm), temperature (32–122°F / 0–50°C), and humidity (10–90% RH)
• Records timestamped data to 2 GB SD card in Excel®-compatible format
• User-selectable sampling rate: 5, 10, 30, 60, 120, 300, 600 seconds or Auto
• Triple LCD for real-time readings of all three parameters
• Maintenance-free dual-wavelength NDIR (non-dispersive infrared) CO₂ sensor
• Includes detachable sensor probe with 11.4" (29 cm) cable
• Powered by 6 AAA batteries or universal AC adapter (AC required for extended use)
• Complete with 2 GB SD card, mounting bracket, and universal power supply

Specifications:

Carbon Dioxide (CO₂)	0 to 4,000 ppm	1 ppm	±40 ppm (<1000 ppm); ±5% of reading (>1000 ppm)
Temperature	32 to 122°F (0 to 50°C)	0.1°F/°C	±1.8°F (±0.8°C)
Relative Humidity	10 to 90% RH	0.1% RH	±4% RH
Datalogging Interval	5/10/30/60/120/300/600 sec or Auto	—	—
Memory Capacity	Up to 20 million data points (2 GB SD card)	—	—
Sensor Cable Length	11.4" (29 cm)	—	—
Power Source	6 × AAA batteries or universal AC adapter (required for operation)	—	—
Dimensions	5.2 x 3.1 x 1.3" (132 x 80 x 32 mm)	—	—
Weight	9.9 oz (282 g)	—	—

Downloads:

Extech SD800 Datasheet