The Extech CO240 indoor air quality meter is an easy-to-use instrument that measures carbon dioxide (CO2), air temperature, and humidity. It also calculates dew point and wet bulb. It is ideal for monitoring environmental conditions in enclosed spaces such as greenhouses, nurseries, factories, hospitals, conference rooms, and schools to ensure proper air ventilation.

Accurate readings displayed on LCD. User settable alarm with audible beeper notifies when concentration exceeds set point. Includes software and cable for real-time data logging onto a PC. Other standard features: Min/Max CO2 value recall, Data hold, Auto Power Off (with disable), low battery indicator, tripod mount. Specifications: CO2 0-9999ppm (±75ppm + 5% accuracy), RH 10-90% (±5% RH), temperature 14-122°F (±2.0°F), dew point -32 to 118°F, wet bulb 12 to 118.8°F. Maintenance-free NDIR CO2 sensor, automatic baseline calibration function.