Paint thickness measurement tools

[mockingbird812]

<span style="font-size: 14pt">Am interested in your experiences and recommendations with the various (there's a bunch on the market w/ a wide range of prices) measurement tools. Would like to be able to use this with paint over steel (not aluminum, fiberglass, etc.). Also, what determines whether a car has original paint wrt thickness? Is this a certainty? Are there different acceptable values for different makes? What technique do you use to assess a car's total paint originality?

Thanks in advance. [img]<<GRAEMLIN_URL>>/biggthumpup.gif[/img]</span>