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Quote: with the salt method you dont need to calibrate it TO another hygrometer what you would need is a ziploc plastic bag.. a small container that you can fill with table salt (a jar lid works fine).. you add enough water to the salt to make it like wet sand.. place it and the hygrometer in...

you don't need a third hygrometer.. just calibrate the ones you currently have.. are they adjustable? you can use the salt method to do that easily enough