Simple nanosecond-width pulse generator provides high performance - Electronics-Lab.com
Python Timer Functions: Three Ways to Monitor Your Code – Real Python
nanotimer - npm
Zeptosecond - the smallest time unit ever measured - BBC Newsround
100 nanoseconds with a speed of x1.0E-9 timer countdown alarm🔔 - YouTube
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timer - How do I make a nanoseconds counter? - Electrical Engineering Stack Exchange