Master clock for small clock network

Over what time interval?

Indeed. And how are you measuring that?

It's measured by Uno board. Period between interrupts on pins 2,3, output send to serial. I am aware there is some error while measuring it and it's not 100% accurate.
That 1ms value is difference between measured and desired time. So far it's cca 1ms during 3 minutes. Even if it's in real 10ms on 3 minutes it is still acceptable.
Any other methods of measuring it that is simple and do not require special hardware?

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