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General Tools & Instruments DAF3009 Compact Mini Anemometer/Psychrometer is ideal for measuring all parameters, including airflow volume and enthalpy of evaporation, needed to install, test and fine-tune the performance of an HVAC/R system. Airflow Volume in ft3/min (CFM) or m3/min (CMM) and Air Speed (with Min, Max, Avg Values). Enthalpy (Btu/lb.); the heat needed to vaporize a liquid. Wind Chill Index (WCI) and Relative Humidity (RH). Power source is 1 CR2032 battery (included). GENERAL TOOLS - THE PRECISE TOOL FOR DOING THE JOB EXACTLY RIGHT. Offering over 1,000 tools, we’re proud to provide tradesmen, craftsmen and DIYers around the world with a broad range of affordable, specific-purpose mechanical hand tools and precision measuring and inspection tools. For inquiries, please contact our Customer Service Department at 212-431-6100. We strive to provide our customers with 100% satisfaction. WORK SMARTER, MEASURE BETTER & BE MORE PRODUCTIVE WITH GENERAL TOOLS