Hi,
Thanks for your inquiry.
Each BME280 and BME680 sensor is factory trimmed, calibrated and tested before delivery to the market. However, after soldering the offset of humidity may change due to the mechanical stress. The humidity difference of 6%RH ~ 8%RH compared to the reference is normal. You can do the compensation in your production line. Please see the attached "BST-BME280-AN006-02.pdf" for more information.
Thanks.
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