This tester is designed to not-destructively measure the thickness of non-magnetic coatings(including paint,enamel,plastic,epoxy,etc) on iron, steel or aluminum. 1.Hold the tester and make sure that it is as least 20cm away from the object to be tested and other objects.Then press the "TEST"button to turn on the tester."--"appear on the display and flashed,meanwhile the unit "mm"appear. 2.Press the "UNIT"button to select desired unit - mm or mil. 3.Place the tester's probe perpendicularly on the surface to be tested, the display will show the coating thickness.
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