This is cool - not sure if it's possible, but it would great if you could determine other things, like is the needle weight correct, or is the cartridge aligned properly (maybe left / right channel would be louder / softer??).

I found the copy on the site a bit gross - I'm not sure something like this needs a critique of modern copywriting, and for me it gives that same weird sense of over familiarity ('we get you') that I think it's trying to criticise.