The Fluke 971 is a handheld temperature and humidity tester dedicated to HVAC and indoor air quality (IAQ) inspection. Equipped with a fast-response capacitive humidity sensor, its backlit dual display shows temperature and humidity simultaneously, and automatically calculates dew point and wet bulb temperature. It supports storage of up to 99 measurement records with Min/Max/Average and Data Hold functions. Supplied with a protective holster and belt clip, it is compact, lightweight and drop-resistant, widely used for environmental acceptance of factories, warehouses, cleanrooms and central air conditioning systems.