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Re:ReMarkable 2.0 – A digital notebook that feels like paper by waterhouse on Friday August 28, 2020 @04:44AM (#24302701)
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

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

Re:ReMarkable 2.0 – A digital notebook that feels like paper by TheRealPomax on Thursday September 03, 2020 @08:29PM (#24370491)
See https://news.ycombinator.com/item?id=24300982 for how that video is the poster child of "very intentionally making it impossible to actually determine real life lag".