I have noticed that even under the same conditions, my Riseman gives significantly different altitude readings in the same place on different days.
I calibrated the correct altitude - where I live is 195m above sea level.
On three days this week, with the same (off the wrist) temperature (+/- 0.5degC), I have had readings from 160 to 250m.
I keep re-calibrating it back to 195m, and then a day later it's way out.
Is this to be expected, or do I have a dud?
I LOVE this watch, so am hoping all will be ok!