Description: 【Measurement】: Mini Thermometer Hygrometer uses a high Accuracy temperature and humidity sensor with a temperature accuracy of ±1 and a humidity accuracy of ±2% (humidity 70%) to ensure accurate monitor of environmental conditions 【Multifunction display】: Humidity Monitor supports switching between Celsius and Fahrenheit to meet different usage habits 【Portable design】: Electronic Thermometer Hygrometer uses a compact 43mm metal shell, which is lightweight and suitable for placement in various space such as musical instrument boxes 【Fast refresh rate】: Digital Thermometer's measurement frequency is once every ten seconds, quickly updating environmental data and controlling temperature and humidity in real time 【Multifunction application】: Humidity Monitor is suitable for musical instrument boxes, homes, etc., to ensure that items are stored at appropriate temperature and humidity levels Size Chart: 4.3cmx1.5cm/1.69inchx0.59inch Package Includes: 1 Hygrometer Thermometer Note: Please allow slightly errors due to manual measurement and different monitors.