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1.1 ,This test method covers the use of magnetic instruments for the nondestructive measurement of the thickness of nonmagnetic coatings over ferrous or other magnetic base metals. It is intended to supplement manufacturers’, instructions for the operation of the instruments and is not intended to replace them.
Note 1—,Autocatalytically deposited nickel-phosphorus alloys containing more than 8 ,% phosphorus are sufficiently nonmagnetic to be measured by this test method, as long as the measurement is made prior to any heat treatment.