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Question hygrometer
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steve30:

--- Quote from: micksmelanie on July 03, 2020, 01:46:40 pm ---digital and needle hygrometer have the same precision?

--- End quote ---

Yes.
ocw:
Typical electronic hygrometer sensor accuracies range from 2 - 5%.  Often that accuracy is only valid over a portion of their measurement range.  Accuracy suffers at the extremes.

A reasonable cost (though far from the least expensive) option is a Renesas SDAH02 evaluation kit using a Renesas HS3001.  The evaluation kit has the sensor mounted along with a display, battery holder and some switching, but no case.  A simple measurement change over time display is available.  The accuracy is +/-1.5% for humidity and +/-0.2 degrees C.  Most less expensive options do not have that accuracy.  It has overkill resolution: 0.01% and 0.01 degree.  Its limitation is not having a remote sensor, although the SDAH02's sensor could be detached and connected via a cable.  I have not tried that modification.  For more information see: https://www.idt.com/us/en/document/man/sdah02-kit-user-guide

I have a SDAH02 mounted in a ventilated case and use it for air measurements at the same time that I am taking soil moisture and temperature measurements at a variety of depths using other sensors.
micksmelanie:

low cost would you recommend the electronic hygrometer or the needle hygrometer?
ocw:

--- Quote ---low cost would you recommend the electronic hygrometer or the needle hygrometer?
--- End quote ---

Compare their accuracy specifications.  If none are listed that generally means that they are not proud of those figures.  Even if good accuracy figures are shown, make sure that they are reliable numbers.
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