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The Helmholtz coils generate a uniform magnetic field perpendicular to the axis of the Teltron D series tubes. The holder allows the coils to be configured in the Helmholtz geometry or to produce magnetic fields aligned vertically, or coaxial, with respect to the tube axis. The maximum field strength generated by the coils(~10mT) is approximately 300 times weaker than that produced by an MRI machine(~3T).