Four Probe Method: Why 0-200mV & 0.20mA?

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Srismiles
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Why we use 0 to 200 mv and 0 to 0.20 ma in four probe method and also why we use only mercury thermometer in this method?
 
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These values are in no way specific to the method. And a thermometer is also not a necessary part of the method either.
You should formulate a more detailed question if you expect a relevant answer.
 

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