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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.
A seismometer is a device that measures the vibrations made be earthquakes. (seismic waves) Seismic waves consist of P(primary) waves LONGITUDIUAL think of them as PUSH AND PULL waves because they move buildings up or down.