One of the newest and fastest humidity sensors ever developed displays full-range humidity changes in 1 second. Monitor labs, clean rooms, food processing and all humidity-sensitive manufacturing and testing areas. Serial RS-232 output allows unit to be connected to a computer or logger for data sampling. Memory recalls maximum, minimum, and average readings. Hold button freezes display for reading later. Each meter comes with a calibration certificate traceable to NIST standards. large display is 1 3/8" High. Meter case is constructed of impact-resistance ABS plastic. Meter includes probe with 40" cable, 9V battery, and traceable certificate.