Intervalometer
![An intervalometer for a reconnaissance camera on a Douglas A-26 Invader aircraft](/Images/godic/202501/20/A-26_Invader_City_of_Santa_Rosa_intervalometer0024.JPG")
An intervalometer is a device which counts intervals of time. Such devices commonly are used to signal, in accurate time intervals, the operation of some other device. For instance, an intervalometer might activate something every 30 seconds. Other names include interval meter and interval timer.