I have the same one as Detail Impressions linked to.
There is about half a dozen that look the exact same on Amazon, and I just bought the cheapest.
I think it was about $120.
Like someone said earlier, it doesn`t give you the thickness of each layer, but only the prohibitively expensive ones can do that.
Mine is nice and accurate, and gives me a general idea of what is going on. You can see it in use here:
Report and pics showng how much clearcoat is removed during machine polishing
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