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PCB companies in center/south Europe usually use mil.
Most use Mils
You will find it very convenient if you use mils.Because most PCB manufacturers also use mils and also the datasheets are in mils as a more easy way.
Mils is mostly used. But sometimes you can use mm, such as If you are using the newer 2mm pitch parts
Meter is the common measure standard in my country , so I converted every inch-based value to millimeters and used it in my CAD-tool.
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