Humidifiers are used to prevent over-dryness that would often result in cracks being formed on an instrument. Over-dryness occurs most often during winter months when indoor heat makes the already dry winter air even dryer. This lack of moisture in the air causes glue that holds the instrument together to lose its cohesiveness causing cracks to form. The humidity indicator would indicate the proper humidity level. The humidifier is placed in the instrument through the f-hole to maintain the correct moisture level in the instrument.
Humidity indicator is included.
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