spoiler
For people that don’t know this is not how you use Calipers
I was indeed (and I think you’re right, the calipers would need at least to be parallel on their outer edges to work this way).
I’m not sure what rz2000 was doing by (slightly wrongly) rewording basically what I wrote — I get the impression they think I was being full of myself for thinking of a (similar) concept that already exists (despite conceding that it already might) and felt the need to put me back in place.
No, I think you correctly identified the shortcoming with the tool if it were only usable for outside measurements. It does turn out that your idea was already implemented, but it is nevertheless a good idea.
The wording however is an echo of a line from Mad Men, where Pete Campbell is talking about coming up with the idea for direct marketing: https://www.youtube.com/watch?v=a05WUtLZfU8
Here is an alternative Piped link(s): https://piped.video/watch?v=a05WUtLZfU8
https://piped.video/watch?v=a05WUtLZfU8
Piped is a privacy-respecting open-source alternative frontend to YouTube.
I’m open-source, check me out at GitHub.