DotTune: AF tune technique without taking photos

I tried it with my lenses. One I was slightly unsure I had the best adjustment. I was one adjustment off on it and the others were right on. Can't say if this is better than the other focus methods but it costs nothing to try and for me it seems to be as good as Focal and other ruler tests I have tried.

For me it seems technically correct. If the green dot is on then the camera thinks it is in focus. It should agree with the focus when it searches focus and settles at what it thinks is correct.