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Opti-Cal offers the opportunity to provide local calibration of RH sensors that is directly traceable to International Standards over a wide relative humidity range and at any set temperature from 50 to 120°F. The Opti-Cal is a stand-alone calibrator for RH sensors providing humidity and temperature profiling with a built in, traceable cooled mirror reference hygrometer. The Opti-Cal compliments Michell's existing humidity generator range and adds the key features of temperature control, traceable reference and fast response.