Abstract: Temperature indicating apparatus having a sensor for introduction into a region having a temperature to be measured and for supplying an analog signal whose amplitude is a function of the temperature therein. The analog signal amplitude is compared with a reference level which represents a preselected temperature level, and a signal is supplied when the analog signal amplitude reaches the reference level which thereby causes pulses to be supplied at a predetermined rate. A timer responsive to the pulses counts from zero to a preselected value and supplies a timing signal when the preselected value is reached. The time required for the timer to count from zero to the preselected value establishes a predetermined timing interval at the end of which a converter responsive to the timing signal converts the analog signal to a digital signal representative of the temperature in the region.