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An intervalometer is usually a handheld device with a long cord that plugs into a cameraâs auxiliary port. It looks and works very similar to a remote trigger release. The type of intervalometer youâll need depends on your type of camera.
Seismometers-instruments that measure motions of  the ground.   The visual output, either on a monitor or on paper is called a  seismograph   Seismometers are in part used to measure the intensity of  earthquakes. The scale used to measure earthquake intensity is  known as the Modified Mercalli scale.