If you are getting a pop up when turning the unit on, it’s the 1.70 (room temp) calibration. Once this is done, there’s no more pop up. So I think it should be fine to go ahead and calibrate at room temperature. If you do a subsequent calibration, which is not 1.70 related, I think you should give it the two hour warm up time first. But you probably won’t need to do this anyway.
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