The complete RH measuring systems provide a fully calibrated, linearized, and signal conditioned 0-1 Vdc humidity output signal for 0-100 percent RH with ۭ percent RH accuracy in a package measuring 1.1 x 0.45 x 0.26 in. An added benefit is complete interchangeability while maintaining the ۭ percent accuracy. Operating from a nominal 5 Vdc supply, the modules can be used with virtually no additional circuitry, and connection to a digital voltmeter converts them into a precision hygrometer. The custom ASIC circuitry incorporates voltage regulation, sensor drivers, linearization, temperature compensation, and signal conditioning to output a fully conditioned, linearized 0-1 Vdc signal. With low power consumption, the units can be supplied as modules or a complete measuring probe/instrument.