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This site states the following, "Simplicity in Coating Thickness Measurement! Designed and engineered as a world-class coating thickness gauge, the state of the art Phase II PTG-3500 series gauges can detect the thickness of coatings on both ferrous and non-ferrous substrates utilizing eddy current and magnetic induction technologies." We noticed that the web site said " The PTG-3500 model coating thickness gauge employs an integrated probe that can automatically detect a ferrous or non-ferrous substrate." It also stated " Measuring range 0-2000 µ m max. The Phase II PTG ." The header had coating thickness gauges as the highest ranking keyword. It was followed by coating thickness, coating thickness measurement, and coating thickness meter which isn't as ranked as highly as coating thickness gauges. The next words the site uses is paint thickness gauges. paint thickness was also included and will not be viewed by web engines.