Can you make your own salt test to calibrate a hygrometer?
No, not one that’s accurate. For a precise professional-level salt test, use a Boveda Hygrometer Calibration Kit to calibrate a hygrometer every six months.
Online, people try to calibrate a hygrometer by filling a bottle cap with salt water. Salt is the key but not in an at-home science experiment.
Salt does naturally regulate humidity—that’s the basis of Boveda and why there’s a saltwater solution in our packs. But Boveda uses specific salts in specific amounts to achieve specific humidity levels.
SHOULD YOU USE THE BOTTLE CAP TEST TO CALIBRATE A HYGROMETER?
No. You'll never receive a precise relative humidity (RH) reading. Your RH reading will vary in a homemade solution, depending on its salt to water ratio.
IS A BOVEDA HYGROMETER CALIBRATION KIT WORTH IT?
YES!
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It's the exact opposite of a homemade salt test— quality controlled and precise. During manufacturing, Boveda goes through a quality control check using an $8,000 machine to make sure the run reads 75% RH.
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It's mess-free. Unlike an open bottle cap, Boveda’s saltwater solution is sealed in a leakproof membrane.
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There’s nothing more for you to add—except a hygrometer.
The Boveda Hygrometer Calibration Kit is the easy way to make sure your humidor’s hygrometer readings are accurate. Takes just 24 hours for professional-level results.