A Youtuber made a Lego robot that moves a pen at a constant speed and took 480fps video of it. He says the 1 had a latency of 54ms and the 2 has its advertised

A Youtuber made a Lego robot that moves a pen at a constant speed and took 480fps video of it. He says the 1 had a latency of 54ms and the 2 has its advertised 21ms. https://www.youtube.com/watch?v=wpwbVwfWIKE&t=17m53s https://www.youtube.com/watch?v=wpwbVwfWIKE&t=17m53s About precision, I'm not really sure. There's a bunch of writing footage in this video, which might have what you're looking for: https://www.youtube.com/watch?v=W9wudCMFWPQ&t=8m10s https://www.youtube.com/watch?v=W9wudCMFWPQ&t=8m10s