I tried to let it go by but just can't. Analogue instruments are not worthless. A Ok analogue hygrometer either bi metal or hair are often more reliable and contestant than the typical used resistive type found in cheap digital hygrometers that drift with time, dirt, dust, contaminants and abuse (bending wires).Originally Posted by Daybreaker
The problem is there are a lot of lower quality analogue on the market the difference is the face card. On a decent one it will be metal so not to interfere with the needle. Card board tends to swell and jam the needle, however if the card is free they are often fairly good at least as accurate as the cheap digital ones that are +/- 5-10% if they are in perfect shape.
Many analogue ones can be calibrated to be perfectly correct some digital ones can as well but cost much more. Being very fussy with such things and having spent many years calibrating a whole variety of instruments I much prefer calibratable analogue hygrometers over digital I have had only one digital remain reasonably accurate (it is about 8% low my worst one is about 55% high) The re-calibratable analogue ones can be adjusted back to correct if they wonder but typically they don't shift much less than 5% a year, unless it gets dropped hard.
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