Abstract: An apparatus is provided for detecting digital pulses or pulse intervals and any combination thereof. Logic means is provided wherein the complement of the interval to be measured is loaded into a digital counter, and certain states of this counter are decoded to set and reset, respectively, an in-bin flip-flop. Operation is initiated when a digital input is received. If the interval to be measured terminates while the in-bin flip-flop is set, an output is generated indicating that a "hit" has been scored and the parameters of the measurement can be read out. Code words stored in a memory provide the specific parameters of measurement, and particular portions of the code words are employed depending on the desired mode of operation.