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.
- 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