I don't have the dedicated space at home here in SoCal, so I have learned how long to warm it up. We don't get full on winters here, but the daily temperature swings can be huge.
What I have observed is a gain shift on the order of 4 mg using a 100 g calibration weight as the basis. The ambient temperature shift of the room and the scale accounts for most of this since I can see that much even when the unit has been left on long term and then the temperature shifts up or down.
So, if you are like me and can't leave the scale on and in a dedicated spot... don't despair. It only takes about 15 mins to stabilize the calibration if the scale has been sitting at the same temperature as the space it will be used, or about 25 to 30 minutes if it was sitting in a place where it was a little hotter or colder than the room you where you will work.
The only critical thing to learn is to watch your cal weight over the time it takes to prep and wait till you see it stabilize before you calibrate or before starting work that is picky. Even that .004/100 isn't a big deal, but you can get it down to the uncertainty of the system if you wait a little.
