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 conditionsMultifunction display: Humidity Monitor supports switching between Celsius and Fahrenheit to meet different usage habitsPortable design: Electronic Thermometer Hygrometer uses a compact 43mm metal shell, which is lightweight and suitable for placement in various space such as musical instrument boxesFast refresh rate: Digital Thermometer's measurement frequency is once every ten seconds, quickly updating environmental data and controlling temperature and humidity in real timeMultifunction 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.