Well, AFAIK, yes you do need two separate PTGs if you want to measure paint on both ferrous/non-ferrous metals and plastics/fiberglass/etc. This is where the DeFelsko company comes to mind.
The Highline, from what I've read, is a great and precise budget PTG. To find a PTG for plastics, check out the DeFelsko PosiTector 200. I hope this is somewhat helpful for you. Good luck.
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