A noter que ce même vendeur a des cibles de calibration
https://www.ebay.fr/itm/OPTICAL-TARGET-RESOLUTION-MASK-OPTICS-BIN-F5-R-19/254186831233?hash=item3b2eb73d81:g:CiIAAOSwVFlUHRtr
mais il vend cher son matos...
You know what, some of my best wafers came from an eBay seller in France, he has the USA blocked now so I wont be able to find him for you in a search but check there first. Don't pay for than $5 or so US, maybe $8-10 for a nice disk. Never pay more than $10.
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