Features: The outer casing is made-of aluminum-alloy, compact-size, strong and durable. Indoor and outdoor mini round aluminum-alloy hygrometer thermometer. Suitable for houses, offices, workshops, schools, shopping malls, warehouses-etc. Large disc with bold-numbers, large metal wall thermometer with hygrometer. with the 10cm diameter disc display,easy to read the temperature and humidity value from distance. Environmental-protection,this wall thermometer implementing concept of green which without batteries, energy saving, environmental-protection. it use different bending degrees of temperature sensitive metals in different temperature environment to realize the display of temperature. Exquisite-design, can display or hangs,metal discdesigned to show more-elegance. large instrument display for easy reading from a-distance. Specifications: Material:Metal Diameter: Approx.100mm/3.93inch Thickness: Approx.30mm/1.18inch Style: thermometer Style: hygrometer Temperature range: 0-120 Humidity range: 0-100%RH Measurement accuracy: temperature 2; Humidity 7% Usage: wall hanging Battery storage type: no battery is needed. Product material: alloy-aluminum Scope of application: this product is widely used in archives, saunas, bathrooms, steaming room, hot-spring room, offices, Hotels, restaurants, schools, factories, conference room, shopping malls, pharmacies, hospitals, laboratory machines. Field, theater, warm and humid nursery, courtyard-home Note: .Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. .Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings. Package includes: 1x Hygrometer Thermometer