Using the new BME280 sensor to measure temperature, pressure and humidity

Folks,
I've put a small write-up about using the new BME280 sensor to measure
temperature, pressure and humidity here:
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Some graphs can be seen here:
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where I have two RPi cards working next to each other at the moment to
compare the results from two sensors, prior to taking the second RPi
downstairs, knowing that its results are reasonably well related to the
first RPi which will remain upstairs.
I would love to know how accurate the humidity reading is - low-cost
devices I've played with show humidity values of 43%, 47% and 49% when
sitting next to each other, suggesting that the +/- 5% specifications of
one of the devices is a realistic value. Will the Bosch BME280 be any
better? The data sheet specifies +/- 3%.
My thanks for Adafruit for making the sensor available and help on their
forum, and to Pimoroni for stocking and delivering them.
--
Cheers, 
David 
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David Taylor
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