The Metravi 550 Deg C Digital Temperature and Humidity Meter is a Thermo-Hydro meter that uses an in-built infrared thermometer to detect temperature and humidity level. Within the 550 Deg C Digital Temperature and Humidity Meter, electricity flows through a small, moisture-absorbent material exposed to the air. As the saturation level of the material changes, so does their electrical property. Therefore, the more humidity is present in the air, the more water vapour the material will absorb. So the Digital Temperature and Humidity Meter measure the changes in electrical properties to collate specific humidity readings on its digital display. Temperature and Humidity Meter is useful to measure temperature, barometric pressure, wind speed, wind direction, and rainfall. Humidity is a critical metric for weather forecasting since it can help indicate the chance of rainfall, fog, and dew. Product Specifications Accuracy: +/- 2 Deg C Brand: Metravi Country of Origin: India Model: HT 3004CT Range: -50 to 550 Deg C Relative humidity: 5 to 95 percent RH