acts as a gauge because it provides true "two-way" purified humidity control. It adds or depletes moisture only as needed to maintain 45% RH - the ideal climate for wooden instruments such as acoustic guitars.Just place 2 packets in double pouch. Put double pouch over D and G strings and let hang down into soundhole. Place 3rd packet under guitar headstock in case. Close case, and you're done. The packet will last anywhere from 2-6 months, depending on the humidity where you are. When the packet become firm, discard and replace. The Humidipak humidity controller is as simple as that!
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