[spudstrawb]

I might as well add my 2 cents worth. My system is still sitting on the desk beside me whilst I get things operational. It has 2 HTU21D sensors, one for inside and one for outside. At the moment, with both of them sitting on the desk less than 1m apart, one is reading 19.6 degrees C and 60.4% humidity, whilst the other is reading 20.0 degrees C and 55.5% humidity. This difference in humidity that I'm seeing is not uncommon since I've had it switched on. I should swap the sensors over and see if the difference stays the same or reverses.