The Boveda One-Step Calibration kit for hygrometers utilizes the patented two-way humidity control packet within a 5" x 5" zip-seal bag. This packet is guaranteed to produce a 75.5% RH within the bag which you can compare your hygrometer to.
Sold as a set of three. Each bag will last up 3 months after initial use. Works best with smaller hygrometers. If using with a larger hygrometer, simply use packet with a larger zip-seal bag.
Product Reviews for Boveda Hygrometer Calibration Kit 3-Pack
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