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There is a automated BESS sharpening meter sold by Vekato:
https://sharpeningtool.eu/de/catalog/accessories.
I did some modification on my own:

• Replaced the clamp arm by a 3D printed arm with magnets to allow higher blades,
• Tuning the stepper driver current settings to give the motor a slightly higher momentum which easily lifts now 1-2kg knives (theoretically a Nema 11 stepper with 0,07Nm should lift 5.6kg) and
  
• slowing down the downwards speed to 12 rpm giving a cutting speed of 0.4mm/s to ensure accurate measurements,
  

it's working quite well now.

Not commercialzed but worth to read about another BESS testing apparatus in a scientific style is available under the following link published by Dr. Martin Henschke. It's in German but maybe you find an online translater. I think it's really worth to read.
https://www.henschke-geraetebau.de/dr/Schaerfetester.html

Very interesting approach. Thank you for sharing your method and all the well documented details including the print files. I know how much work it takes getting to that.

Hello Hanns,
cool idea to make life easier. If you design your self-centering knife jig in a way to simply adjust the tool length it fits perfectly to this length measurement tool. Looking forward to see both products in action at your youtube channel.
Cheers