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What is known as PMI?
How the test can be done?
& What for this test?
PMI is a fairly common acronym. Which PMI are you referring to?
Isn't PMI industrial strength PMS?
PMI stands for Positive material Identification.
That was all I could think that might be relevant.
Just to add , it seems to be non-destructive testing of metals using portable equipment such as a fluoroscope. Look at TCR Engineering on the web.