Hi Sir: Please see my comments: 1. Yes, the second calibration has to be done due to soldering. 2. There are small variation in sensor A and sensor B's readings when placed in the same environment, but these can be ignored. It is better for calibration under the same stable environments. Consider the different performantce of the different pressure sensor, these gap will be bigger or smaller with pressure change or temperature change and not over the accumulated values of the relative accuracy with 100hPa step. 3. Yes, after soldering, calibration is recommended.
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