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Magnetometer
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===Directional drilling=== Magnetometers are used in [[directional drilling]] for oil or gas to detect the [[azimuth]] of the drilling tools near the drill.<ref name=":0">{{Cite web |title=GMW Associates - Oil & Gas |url=https://gmw.com/industry-application/geophysics-oil-gas/ |access-date=2022-03-16 |website=GMW Associates |language=en-US}}</ref> They are most often paired with [[accelerometer]]s in drilling tools so that both the [[inclination]] and azimuth of the drill can be found.<ref name=":0" />
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