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diamagnetometer

diaˌmagneˈtometer
  [f. diamagnetism) + Gr. µέτρον, after magnetometer.]
  An instrument for measuring diamagnetic force.

1886 Wormell tr. Von Urbanitzky's Elect. in Serv. Man (1890) 180 Weber constructed an instrument, the diamagnetometer, by means of which he measured the magnetic moment of bismuth.

Oxford English Dictionary

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