What Is This Tool? [video]

(www.youtube.com)

1 points amelius | 1 comments | 10 Jul 25 17:31 UTC | HN request time: 0.205s | source

1. amelius ◴[10 Jul 25 17:31 UTC] No.44523384[source]▶

Anyone who knows what kind of measurement tool this is and what principle it uses?