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Also does it show the watch RTC oscillator is not T compensated (not TCXO)?
yep, TCXO would be much more stable over temperature range.
This is really interesting! Guess it will vary somewhat from watch to watch?
Most likely, and this article says that crystals have aging effect so it also depends on watch age.
... two temperature sensors earlier (barometer and internal temperature sensor) ...
What internal temperature sensor ?
malaire-
https://www.espruino.com/Reference#l_E_getTemperature
This one.
Use the microcontroller's internal thermistor to work out the temperature.
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Most likely
Want me to test that? I have a raspberry pi 3B+.
Would be much appreciated if you can provide a step by step guide to set the measuring up. I can probably gather it from the thread but it will take quite a bit of time.
myownself
Poolitzer
This is really interesting! Guess it will vary somewhat from watch to watch?
On a tangentially related note, I was looking at the two temperature sensors earlier (barometer and internal temperature sensor), and I was surprised that they read pretty much the same. I don't know why I have in my head that another component might have a temperature sensor built in but not exposed... I might be misremembering something though.