Sorry, this product is no longer available. Demand for quality indoor air continues to increase as we are spending more time indoors than ever before. Poor air quality may cause tiredness, inability to concentrate, and even illness. Assessing indoor air quality using professional-grade measuring instruments is the first step in creating a healthier work environment. Monitors have large, easy-to-read displays that continually present air temperature, relative humidity, and CO₂. Ideal for observing indoor air quality in crowded public spaces such as offices, factories, classrooms, hospitals, and hotels. Units recall min/max CO₂ levels and provide visual alarms for maximum threshold. Automatic baseline calibration and maintenance-free non-dispersive infrared sensor ensure long-term accuracy, stability, and reliability. Records up to 32,000 data points that can be downloaded to your computer using the included USB cable and software. Unit comes with an AC adaptor and will stand on a desktop or wall mount. Temperature range of -14° to 122° F (-10° to 50° C), accuracy of ±1.2° C, ±2.5° F. Relative humidity range of 10%-90%, accuracy of 1 ppm. CO₂ range of 0-9999 ppm, accuracy of ±75 ppm. 4-1/2 x 4-1/4 x 1.