Hygrometer - Accuracy Test [HOWTO]

[MTopPA_18707]

These two tests check the hygrometer at 95-100% Rh and at 75% Rh.

95-100%
- wrap the hygrometer in a very damp [but not wringing wet] hand towel.
- put the whole thing into a gallon zip lock bag,
- After ~8 hours, check the reading . . . it should be about 95~100%

75% "Salt Test"
- fill a clean cap [ from a 2 liter soda bottle] with house hold table salt.
- add enough distilled water to the salt to form a watery salt paste.
- put this cap and the hygrometer into a zip lock bag
- After ~8 hours it should be about 75% Rh

Google for more info . . . . . LINK

Warm Regards,

-Xriva

 

[enggass]

Everywhere I read, the paste should not be watery. Just enough water to make a paste but no excess water.
OR you can use one of these...
http://www.amazon.com/gp/product/B000A3UBLA/ref=oss_product

 

[matlock585]

http://www.puff.com/forums/vb/cigar...990-how-salt-test-hygrometer-calibration.html

This one is from a cigar smoker's forum, but a hygrometer is a hygrometer....

if you test and yours reads 73%, then you add 2% to the readings you get after that. My accurite dual digital was off by -1