The reading values of five-types electronic RH sensors at standard RH environment that produced by saturated salt solutions were used to test the performance of accuracy, precision, stability, and aging condition. The adequate calibration equation was estabilished by regression analysis technique. The experimental results indicated the precision of Capacitive type sensor was good in the full of RH range, however, the Resistance type sensor only had good performance in the lower and medium RH range. The accuracy of Capacitive type sensor can be improved by quadratic calibration model. The S. E. values are below 1.0%RH. The adequate calibration model for Resistant type sensor inclued a four-degree polynomial eqnation. The accuracy is above 3.5% RH. The aging condition was not significant within a half year for Capacitive type sensors.
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