Thermometer-Hygrometer(43mm/1.7") for Guitar.About the productAesthetics: The thermometer and hygrometer use an alloy frame, which is not only very durable, but also exquisite in workmanship and appearance. exquisite.Function: mainly used for humidity and temperature measurement of musical instruments like violin, guitar, etc.Measurement range: humidity measurement in the range 20~100%, temperature measurement temperature in the range - 25 ~ 55 ℃ / - 13 ~ 130 ℉. Good accessory: the thermometer and hygrometer are small and portable, can be placed on a violin or guitar case, do not require batteries, and can display clearly the current humidity and temperature. Greatly beneficial for the storage and maintenance of your valuable instruments. Great Gift: This thermometer and hygrometer is a practical gadget for instrument enthusiasts and those who receive this gift will be delighted. This thermometer and hygrometer is a practical gadget for instrument lovers. It's small and portable, can be placed on a violin or guitar case, requires no batteries, and clearly displays the current humidity and temperature.Greatly beneficial for the storage and maintenance of your precious instruments. Features: With alloy frame, exquisite workmanship and exquisite appearance. Round, small and portable, it does not take up much space. Humidity is measured in the range of 20~100%. Temperature measurement in the range - 25 ~ 55° / - 13 ~ 130°, simultaneous display of ° and °. It is mainly used for humidity and temperature measurement of musical instruments such as violin, guitar, etc.Specifications:Condition: 100% Material: AlloyColor: gold, silver.Suitable for: violin guitar instrument cover, etc.Humidity range: 20~100%RHTemperature range: - 25 ~ 55° / - 13 ~ 130°External diameter:about 4.3 CM / 1.7 inch Weight: about 23 grams Package Included: 2 x Hygrometer Thermometer Instrument (Golden, Silver Color) Note: The data are all manual measurement, please allow 1 - error 3cm; due to the difference in light and display, there would be a certain color difference, please refer to the actual object received.