TH-CALC™ thermohygrometers are designed to measure temperature and humidity. Each handheld instrument uses a single probe to measure multiple parameters, says the company. The Model 8720 records temperature and humidity, and calculates dewpoint. The Model 8722 adds datalogging, and performs wetbulb temperature, absolute humidity, humidity ratio, and % outside air calculations. The meters are used for such applications as conducting thermal comfort studies, verifying building hvac system performance, and detecting IAQ problems, the company says.

TSI Inc., Environmental Measurements and Controls Division, P.O. Box 64394, St. Paul, MN 55164; 800-777-8356 or 651-490-2711; 651-490-2874 (fax); (e-mail); (website). eProduct #185

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