![[Laser cut and engrave] Laser Engraved Metal Calibration Test Grid with Measurement Markings](https://storage-us.atomm.com/resource/xtool/community/attachment/xtool-community/007019d9-3452-4d40-969b-dcb1fa99acdb.jpg?x-oss-process=image/resize,w_1200,h_900,limit_0/interlace,1/format,webp/auto-orient,1)

This is a simple yet practical grid made on F2 (and should work fine for F1 as well).
Keep in mind, it’s a permanent mark on your machine plate, and if not done properly, you could permanently damage its aesthetics. Proceed at your own risk!
Enjoy!