3 ms·
I found this video https://youtu.be/kpsN78mQ6YY https://youtu.be/kpsN78mQ6YY They use a laser pointer to measure width of a hair.
by econcon 6y ago
I found this video
https://youtu.be/kpsN78mQ6YY https://youtu.be/kpsN78mQ6YY
They use a laser pointer to measure width of a hair.