Hi Inburrito, look out for MC with an output voltage of about 0.6-0.85 mV. They will like a matching impedance of about 500R. The suitable source impedance is a result of resistance due to more wire ( and its diameter ) on the MC's coil - resulting in higher source impedance which calls for a higher matching impedance in the SUT.
Cheers,
D.
Cheers,
D.