Abstract: Temperature dependent and reference time intervals are simultaneously generated and differentially combined to provide a temperature signal that is employed to generate a probe linearization signal for combination with the temperature signal and digital display. A low resistance platinum probe carries a low current in a timing circuit having a small capacitor charging to a relatively high voltage to provide a high gain for temperature to time conversion circuitry. A continuous real time probe linearization signal is computed for large temperature readings by a double integration circuit having an adjustable readout time for determining the magnitude of the twice integrated temperature signal.