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The Seismograph, also known as an "Earthquake Tracker", is one of Gary's inventions. It tracked the Earthquake Driller in the mission Mysterious Tremors. Later, it was seen again in the Gadget Room. Not much is known about the seismograph. To measure seismic activity (vibrations and sound waves), it uses an over-sized stethoscope.
- It only appeared in PSA Mission 8: Mysterious Tremors.
- Seismographs are used in real life to predict the likelihood of an earthquake and how hard it will hit. Seismographs can also predict if any tsunamis are going to attack.
- Unlike most of Gary's inventions, the Seismograph does not have a 'thousand' number at the end (e.g. Seismograph 3000).