Looks like a very handy gadget and for a lot more than just knifemaking. It's the same principal as a level I've used the last forty years or so welding but in a much smaller package. I'll keep an eye out for the video and may be interested in one when you get them available.
Since you have posted pictures and explained their use I could just go out in the shop and build my own.
Just kidding.
Since you have posted pictures and explained their use I could just go out in the shop and build my own.