Checked my hygrometers and they are off......Help w Calibration

lockedhearts

It's All About Chicken Math
12 Years
Apr 29, 2007
5,028
8
271
Georgia
I have 2 acurite Hygrometers, I did the salt test and checked them this morning. One was 12 off the other 14, I can't find my instructions and don't see any obvious way to calibrate them manually. Any help, please!
 

patandchickens

Flock Mistress
12 Years
Apr 20, 2007
12,520
335
341
Ontario, Canada
Some hygrometers have a screw on the back that you can adjust.

However most of the time you are not going to actually be able to *calibrate* it as such, in the sense of adjusting the dial... what you need to do is put a piece of masking tape somewhere on the front that says "subtract 12 for real #" (or whatever the relationship is for your particular hygrometer). And then, when you read it, make the adjustment mentally -- so if it is reading 12 points high, and you are aiming for an actual humidity of 40%, you want the dial to read 52%.

Good luck, have fun,

Pat
 

lockedhearts

It's All About Chicken Math
12 Years
Apr 29, 2007
5,028
8
271
Georgia
That is what I have always done, although these were low? It is supposed to read 75% correct ?
 

patandchickens

Flock Mistress
12 Years
Apr 20, 2007
12,520
335
341
Ontario, Canada
Yup, 75% at equilibrium with the wet salt in the baggie -- so if your hygrometer is reading only 63, write a note on it "add 12 for real #"
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Good luck, have fun,

Pat
 

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