Function: Humidity measurement for violin, guitar and other musical instruments. Key benefits Helps protect instruments by monitoring ambient humidity in cases or storage spaces. Operates without electricity. Clear display of current humidity for quick, easy reading. Compact and portable; easily placed inside violin or guitar cases. Alloy frame with flush mounting for durability and an appealing, unobtrusive look. Specifications and build Material: alloy frame with flush mounting. Portable, small form factor designed for instrument cases. Displays current humidity clearly without the need for batteries. Compatibility and performance Designed for violins, guitars and other similar instruments. Suitable for storage and ongoing maintenance of valuable musical instruments. Provides reliable humidity readings to support proper instrument care. Use scenarios Incase storage: place in a violin or guitar case to monitor humidity during longterm storage. Travel and transport: keep in the instrument case during trips to maintain consistent conditions. Studio or home maintenance: position in the instrument room to track humidity during sessions or between uses. This hygrometer offers a practical, durable solution for instrument enthusiasts who need a simple, reliable way to monitor humidity without batteries, while maintaining a neat, quality appearance.