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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Michael.F
OK I did some measurements on my two watches.
First is about 54 PPM.
Second is about 20 PPM.
With the first I experienced many disconnect when connected to my PC to upload new software and such. Especially in beginning. Second watch is much more stable connected. I do believe it would be better to configure softdevice to 50 PPM tolerance on LFCLK.