Quote:
Originally Posted by snake man12
Yeah its one of those cheapy petco ones. Explain the salt test please 
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You can look it up on youtube if my explanation doesnt make sense.
You take a normal bottle cap from a water or coke bottle, fill 3/4 with table salt. Put water in the bottle cap, but only enough to make the salt pasty. You dont want any extra water on top of the salt. If there is excess water on top, you can use a paper towel to soak it up until all you see is pasty salt.
Then take a ziplock bag or a tupperware (or airtight) container, and put both your analog hygrometer inside, as well as the bottle cap with pasty salt. Wait 8-24 hours. It should read 75%.
If theres a dial at the back, you can adjust it. But IMO if it doesnt read 75 (or at least close to it) then I would try and get a digital one. Accurites are only $15 and give you two temperature readings and a humidity reading.