I got clean 132ms RT when I tested with them at the BB booth at sfn

https://www.tandfonline.com/doi/full/10.1080/15592324.2024.2310977?src=exp-la

THEIR BOOK IS AMAZING for amateurs

also arthur jensen wrote an entire book on mental chronometry - https://arthurjensen.net/wp-content/uploads/2020/04/Clocking-the-mind-Arthur-Jensen.pdf
Just get bolt.new to write a RT webapp or a digit symbol coding one

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Some resources (psychonomics/psychometrics) here

Is there a good online test.

Human Benchmark but the averages are way off