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Re: how accurate is the barometer and the thermometer?

You may be comparing your Casio (which reports "station pressure", the pressure at the watch location) with a pressure that has been adjusted to sea level. Pressure values from weather stations and airport control towers are adjusted to sea level, not local pressure.

Some watches display sea level pressure. You may be able to get them to display local pressure by setting the altitude to zero. Some altimeter watches can display both pressures at the same time. Make sure you are comparing to a station pressure value.

I have two Casio altimeter watches. One agrees with all my other altimeters, within 1 mbar, when all are displaying local pressure. The other watch is about 4 mbar off.

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