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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
I did not measure it precisely, my reply was based on the example in the app linked which based on 5 sec drift in 24 hours which is over 50ppm.
I will try measure it more precisely.
20ppm is 1.7s per day.
I have two Banglejs 2, the first is where I experienced big drift, only had the 2nd for a week and have feeling it more accurate.