Mechanical: The Thermometer Hygrometer Is Engineered Without The Need For Batteries, Providing A Sustainable And Low-maintenance Solution. 2 in 1 Design: Monitor Both Temperature And Humidity Effortlessly With Our Dual-function Device, Ensuring A Comfortable Indoor Environment. Easy To Read: Featuring A Clear And Fine Dial, Reading The Scale Is Simple And Convenient, Offering Quick Access To Vital Information. Good For Health: Maintain Optimal Living Conditions By Controlling Indoor Temperature And Humidity, Benefiting Skin Health And Allergen Management. Wide Applications: Suitable For Diverse Settings Including Houses, Schools, And Workplaces, This Device Is A Versatile Addition To Any Space. Experience the convenience of a battery-free indoor thermometer and hygrometer. Perfect for a variety of locations, this tool offers reliability and ease of use in monitoring environmental factors crucial to well-being.