Hi Giles-- There are lots of good information sources out there. Google on "humidity sensor calibration" (including the quotes) and you should come up with a hundred or so ... forget the quotes and you'll likely find closer to 100,000! The best place to start though would be the FAQ page of your manufacturer, or better yet, the manufacturer of the sensor if you can find that out. RH calibration is very temperature dependant ... condensing humidity can destroy some types of sensors ... 0.1% accuracy is realistic.
Good luck. Regards/Roger, in Bangkok -----Original Message----- For a long time most inexpensive humidity guages were not noted for their accuracy and precision. Recently a number of inexpensive electronic instruments have appeard on the market (Oregon Scientific is a major supplier, but all of their units are actually made in China). Does anyone know how accurate these units are? They read to a tenth of a percent, but I would be happy if I could be confident they were accurate to within five percent. I broke my sling psychrometer and have no ready method of calibration. Any info appreciated. Giles Smith Santa Monica, CA
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