Equipped with metal-oxide semiconductor sensor, Model HHAQ-107 measures mixed gas volatile organic compound levels as part of indoor air quality maintenance program. Handheld unit can detect ammonia, toluene, ethanol, hydrogen sulfide, and cigarette smoke as well as ambient temperature, relative humidity, dew point, and wet bulb temperature. Suitable for HVAC and IAQ technicians, meter includes data logging software, backlit dual-readout LCD, and adjustable high VOC concentration audible alarm.