Hello List, Dampp-Chaser makes a Wet Humidistat designed to address grey market pianos. The calibration set point for this Humidistat is in the range of 48-50% relative humidity. It is also quite effective when installing a new Climate Control System in any piano that has been in a humid environment for an extended period of time. Roger Wheelock Dampp-Chaser Corp. roger@dampp-chaser.com
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