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I have had good results with using aluminum dibond with a calibration pattern glued on. I go to 858 Graphics (that link has pricing information, which is very reasonable for small boards) and just send them a PDF file with the calibration pattern. There are likely similar shops wherever you happen to live.

This is a Python script I use to generate the PDF files I send to them. That script requires you to fiddle with the text placement a bit, but I've found it convenient to have the pattern details printed on the board so you don't forget the sizes a year from now.