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An intervalometer, also called an interval meter or interval timer, is a device that measures short intervals of time.[1][2] People commonly use such devices to signal, in accurate time intervals, the operation of some other device. The intervalometer measures the intermittent pulses between a starting pulse signal and an ending pulse signal, before a pulse counter measures the number of pulses released into the appropriate time interval.[3] For instance, an intervalometer might activate something every 30 seconds.