Data Logging Indoor Air Quality Meter with Humidity Calibration Standards

• Includes: R9905 Data Logging Indoor Air Quality Meter, R9933 33% Humidity Calibration Standard, R9975 75% Humidity Calibration Standard
• Measures carbon dioxide (CO2), temperature, humidity and automatically calculates time-weighted average (TWA) and short-term exposure Limit (STEL)

Specifications:
CO2 Range: 0 - 30000 ppm
Temperature Range: -4°- 140° F ( -20° - 60° C )
Humidity Range: 0% - 100% RH