3 in 1 Weather Station: This 130 mm device combines thermometer, hygrometer and barometer for comprehensive home weather monitoring. Accurately measure temperature, humidity and atmospheric pressure in one compact unit. Precise measurements: Temperature range -30C to 50C; relative humidity 0-100%; air pressure 970-1050 hPa. High resolution provides reliable weather forecasts. Sturdy construction: Made of high quality aluminum for durability and long term performance in indoor environments. No batteries required: Mechanical movement allows battery-free operation for continuous monitoring without power sources. Use scenarios: - Living room or bedroom: monitor comfort levels and adjust heating, cooling or ventilation as needed. - Workshop, studio or instrument storage: protect materials from humidity swings and pressure changes. - Office or classroom: track weather and indoor conditions without relying on electricity.