>> Things can be calibrated using a good thermometer, a Styrofoam
>> cup of salt and a  microwave.  Heat the salt...
>
> Does salt heat in a microwave?

No, unfortunately.

You need a bond that gets all excited about 2.4 GHz, which water has, 
or a conductive loop at a substantial portion of a  wavelength on a 
side or greater. Salt has neither.


        RM



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