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RH measurements are never particularly accurate, I think+/-3% is usually considered good
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so got a cheap hygrometer from Amazon, which matches the Meaco to within 1%.
Those cheap hygrometers can be wildly off, I've had some 10-15% off so you need to calibrate them but it's pretty simple to do.
Put a teaspoon of salt in a bottle cap, add a few drops of water so it turns into a paste, put the lid and the hygrometer in a ziploc bag and leave it over night. The reading should be 75% so if your hygrometer is showing 72 then you know how far off it is, you can't normally change the reading on the cheap ones so you'll just have to remember to subtract or add to what ever it shows.
You can then use the cheap hygrometer to calibrate your other ones.
eskay
Gewürzt
@hvsds
just a word of caution for anyone relying on the humidity readings in/on their Nest thermostat, that they may not be accurate and read too high.
noticed the numbers on the dehumidifier (fancypants Meaco Arete) were a good 10-15% off from the Nest, whilst in close-ish physical poximity, so got a cheap hygrometer from Amazon, which matches the Meaco to within 1%.
there’s also this thread with lots of folk reporting similar issues, with the only real fix being getting a new unit.
could be worse i suppose, in that at least this old house is consistently in the low 50s rather than mid 60s %RH-wise!