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https://www.welectron.com/eeRuler-PCB-Rulerthis is also nice! I just got the 30cm!
you could just take the Adafruit design and double it... then you can make it wherever you prefer for cost purposes.https://github.com/adafruit/Adafruit-PCB-Ruleror even better than doubling the adafruit one, design your very own exactly how you want. It's not rocket surgery.You can put on an actual circuit where you have a button cell and a micro that flashes a bunch of LEDs, or something.these ones look cool.https://www.sv1afn.com/pcbruler.html
I have one that you can have for free, should be ~$13.75 to ship to Germany. Got it from a trade show a few months back.
I've got a spare one.As soon as the environmental heat permits me walking to the local Post shop, I'm gonna mail you that one, may take a few days.