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No best answer has yet been selected by sonicjo. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.You go to google type "Hall probe" calibration and read through a few helpfull links until you reach this one:
http://www.thestudentroom.co.uk/t98749.html
Which is a discussion on using Helholtz coils to do this very thing