19-8049 Comfort Chek 200 indoor air quality analyzer with built in sampling pump. Also with CO2, barometric pressure, temperature, relative humidity and CO measurement. Includes data logging and BATTERY charger. (Range: 0 10,000 ppm CO2, 21 36 Hg pressure, 0 104 F temp, 0 99.9 % RH and 0 500 ppm CO).