You can get an inexpensive digital caliper at Harbor Freight. When on sale (just about all the time) around $12.
I measured my with some big washers that were thicker than the lip on both sides of the rotor and then subtracted the thickness of the washers.
Kind of hard to tell what 1 mm is with my fingers
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2004 Boxster S 6 speed - DRL relay hack, Polaris AutoTop DIY
2004 996 Targa Tip
Instructor - San Diego region
2014 Porsche Performance Driving School
2020 BMW X3, 2013 Ram 1500, 2016 Cmax, 2004 F-150 "Big Red"
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