Hello! I have the same problem. I have two BME280 sensors soldered on the little PCBs, which i bought on Aliexpress. Both of them are accurate in temperature and pressure, but show different RH compared to each other and compared to the calibrated Honeywell's HIH4000 analog RH sensor. One have a constant offset about 20% and another 7% relatively to HIH4000 measurements. Is it possible that the producer of the PCBs damaged sensors during reflow? Can reconditioning procedure restore the calibration of the sensors?
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