AIR QUALITY MONITOR The TSI Alnor IAQ-CALC 7525 meter is an outstanding instrument for investigating and monitoring indoor air quality. The 7525 simultaneously measures and datalogs multiple parameters including CO2, temperature, humidity and is capable of performing calculations such as dew point, wet bulb temperature, and % outside air. With such a wide range of functions in a handheld meter, the 7525 is an excellent choice for a wide range of functions such as verifying HVAC system performance and to ensure compliance with IAQ regulations and guidelines. TSI Alnor model 7525 IAQ-CALC meters utilize stable, accurate sensors and displays up to three parameters simultaneously. An internal datalogger feature logs up to 30, 300 data points with all measured parameters enabled. Data can be easily transferred to a computer with the included LogDat2 software. The software also facilitates easy report generation and includes a statistics function that displays average, maximum and minimum values, and the number of recorded samples. The TSI Alnor model 7525 IAQ-CALC meter ships complete with meter and probe, Logdat2 downloading software with USB cable, AC adaptor, hard carrying case, batteries, operation and service manual, and NIST calibration certificate. Features Part number 7525 Manufactured by TSI Alnor CO2 Range: 0 to 5000 ppm Accuracy: ± 3.0% or ± 50 ppm, whichever is greater Sensor Type: Dual-wavelength NDIR Temperature Range: 32 to 140° F ( 0 to 60° C)  Accuracy: ± 1.0° F ( ± 0.6° C)  Sensor Type: Thermistor Relative Humidity Range: 5% to 95% RH Accuracy: ± 3.0% RH Sensor Type: Thin-film capacitive Calculates % outside air, dew point & wet bulb temperature Datalogs up to 30, 300 data points with all measured parameters enabled Log intervals: 1 second up to 1 hour ( user selectable)