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The HG-1 is a high precision, portable humidity calibrator. Using Michell's Optidew Chilled Mirror instrument as the reference measuring instrument, humidity can be controlled across the range 2 to 95% RH (at room ambient operating temperature). The HG1 is configured to operate as a stand alone calibrator or to operate from a dry compressed air supply enabling easy on-site calibrations. The front panel mounted flow-meters enable the mixing ratio of a dry and wet air stream to generate the required humidity. The chamber cover can be customised to suit the transmitters and sensors being calibrated.