Quote:
Originally Posted by Geo
Sorry for late answer but i don't read this forum so often.... 
The frequency for every metal depending of the magnetic field at your area. So find the NMR frequency and adjust 10*(NMR freq).
For example at my area the magnetic field is 46500 and the NMR frequency of copper with isotope 63 is 525Hz, so you must set the frequency of oscillator at 5250Hz.
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Hi geo tank you very much dear freind How do I find the Earth's magnetic field?