Abstract: The invention is of a method of measuring timepiece beat interval accuracy comprising, according to the embodiment shown, a microphone and amplifier to transform the mechanical beat of a timepiece to an electrical signal and amplify that signal. The signal is then sent through a conditioning circuit that makes the signal into a uniform output that represents the beat of the timepiece. The uniform output is then submitted into an input/output port of a computer. This input is then interpreted by the associated software and the resultant data are displayed on a printer or monitor. The displayed material will consist of representations of the relative timing of the mechanical beats of the timepiece or the mechanical malfunction of that timepiece. The method of measuring the timepiece beat interval accuracy comprises the associated software that has been prepared to interpret the data submitted to the computer and to display that data in a predetermined format.