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 This round wall Thermometers and hygrometer ( humidity measurement) to monitor weather 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 The decorative Thermometers 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 / Thermometers 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, Manufacturer: uikios