Cartridge alignment tool

I recently updated the cartridge on my Pro-ject EVO2 and needed to align it. I could come close using just my eyes and a protractor but I wanted a more accurate alignment. I created this tool which I home you find useful. You take an image as shown below with your iPhone/iPad and the app uses computer vision to measure the angle with resolution of 0.1 degrees.

https://rawmean.github.io/CartridgeAlignment-Website/index.html

https://preview.redd.it/kthsvsmmuboh1.png?width=480&format=png&auto=webp&s=dc63bd77aa581cb5a64f4d392437ee388ab4290e