The decorative thermometer and hygrometer consists metal enclosure suitable for exterior mounting, you can use this garden hygrometer for a long for time without damage This garden hygrometer/thermometer accurately measures temperature and humidity simultaneously ranges between -30 and 50 °C to accommodate all climates, humidity range from 20 to RH, to keep house or garden in great condition Can be placed indoors or outdoors, including baby rooms, offices, laboratories, balconies, Its stylish and refined shape makes it a perfect addition to any patio, room, or garden This round wall thermometer and hygrometer (humidity measurement) to monitor weather condition This hygrometer uses a built-in mechanical movement that enables real-time sensing, so you don'for t need to calibrate it and does not require a battery, Manufacturer: SkyPOOU