About This MEASURES: Makes ballpark measurements of total VOC concentration, and accurate measurements of ambient temperature, relative humidity (RH), and Dew Point and Wet Bulb temperatures. DETECTS: Metal-oxide semiconductor sensor within vented ball housing detects ammonia, toluene, ethanol, hydrogen sulfide (H2S) and cigarette smoke. LOGS UP TO 32,000 DATA POINTS:. Meter's entire capacity can be devoted to VOC readings, or devoted one-third each to VOC, ambient temperature and RH readings. POWERFUL DATA LOGGING: Software downloads readings to a PC for display/printing as a table or graph. The software supports four data logging modes, including starting and stopping recording without a PC. IDEAL FOR: Making ballpark measurements of mixed-gas volatile organic compound levels as part of an indoor air quality maintenance program. GENERAL TOOLS: We're a recognized leader in designing and developing specialized precision tools dedicated to delivering exceptional customer service. We encourage artisans and DIYers to work smarter, measure better, and repair more productively. Overview Brand : General Tools Product Dimensions : 2.81"W x 8.56"H Item Weight : 0.43 Pounds Battery Description : Six AAA batteries Lower Temperature Rating : 32 Degrees Fahrenheit