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The best way to measure end-to-end latency is an Arduino with a light sensor, with the Arduino programatically injecting USB events. I made an Amazon shopping list[1] a year ago. I hope to rework my code and post a blog soon.

[1] https://www.amazon.com/ideas/amzn1.account.AGSZP5AWBGH7772O3...

2 comments

If you're into this sort of thing I recommend reading this article: http://www.tftcentral.co.uk/articles/input_lag.htm

It goes into a lot of depth on input lag and how to measure it accurately. The site also happens to have recorded input lag numbers for hundreds of monitors.

In the article it mentions using photo sensors and oscilloscopes as the best way to get a reading but they settle on using a special type of stopwatch test that gets results that are nearly the same.

I did such a thing a while ago at my last job. I guess it still works https://github.com/strawlab/lagtest