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The Adafruit ruler is open source (https://github.com/adafruit/Adafruit-PCB-Ruler https://github.com/adafruit/Adafruit-PCB-Ruler) - I suspect the eBay ones are
by tesseract 9y ago
The Adafruit ruler is open source (https://github.com/adafruit/Adafruit-PCB-Ruler https://github.com/adafruit/Adafruit-PCB-Ruler) - I suspect the eBay ones are clones of it.