Anyone used a USB microscope to align cartridge?

Here some pictures with a Dynolite 220x

https://www.dropbox.com/s/49jq2eyqssnr43w/EMT%20JSD6%20Diamamond.jpg?dl=0

https://www.dropbox.com/s/kqe3cqruvtq128z/Diamant%20verdreht%20Skala.jpg?dl=0

https://www.dropbox.com/s/skw82l9yohw3pna/VTA%20Kleos.jpg?dl=0

https://www.dropbox.com/s/f6a9ow4gam58u3v/AT%20OC-9.jpg?dl=0

https://www.dropbox.com/s/wmokgjww3nxvyx5/AT-OC9%20Mikroskop%20Verrundung.jpg?dl=0

https://www.dropbox.com/s/c4mo6g2avtkbnin/Black_von%20seite%20220fach.jpg.jpg?dl=0

What is very important is a possibility to place the microscope good and to move it sensitive.

I have rebuilt a vernier height gauge.

https://www.dropbox.com/s/yvbpuz3hp3yt572/Dino%20Lite.jpg?dl=0

Great pictures ninetynine.

I have used a cheapish scope, a Veho 400x from amazon.
http://www.veho-world.com/main/shop_detail.aspx?article=40

Not as good as the Dynolite but does give decent results. Needs a lot of patience to get clear images

this is a photo of my Lyra at approx 91/92 degrees in my 4point arm which has adjustable VTA.

https://www.dropbox.com/s/hygrlyr7nm7ydsi/Atlas-92.5-degSmall.jpg?dl=0

It is a useful way of getting a ball park figure and yes there can be errors. Fremer gives step by step guide on his analog planet site.

After an approx initial set up with the microscope, I adjusted the SRA/VTA by ear. Then checked again with the scope, that is the image link above. I was reassured that the best sounding position correlated with the visual confirmation.

I use a mini oscilloscope and test tone LP to adjust the azimuth.

Great pictures Nine and Veho. From the microscopic view, how do you get the overlapping lines for SRA/VTA? Do you photoshop them in and then estimate the angle or does the microscope have a grid on it? Also, in looking at the digital microscopes some of them have a longer working distance which would seem to me to be a better option. Comments?

Thanks Lubachl.
I used Adobe illustrator as it gives a bit more control over the placement of lines, then printed out the image and measured the angle.

The veho is fairly cheap, I believe the dynolite has some software to enable the placement of measurement lines.

I had to remove the clear plastic cowl around the lens on the veho to be able to get the scope close enough to focus. I think this also necessary for the dynolite.

It is very fiddly to position the scope relative to the stylus to get a good image. Time and patience required in abundance. A longer working distance might well be an advantage.

Fremer on his analog planet site describes his methodology for using a usb scope.

Dino-Lite has measuresoftware in the software.