An indispensable tool for experimental measurement of relative humidity of the air. It is widely used in grain storage, greenhouse cultivation, breeding, tobacco harvesting and drying, weather observation, food processing, etc. OOTDTYCompy:Function: analog thermometer and hygrometer measures temperature and humidityEasy to read: bold and easy-to-read numbers, can easily read the measurement data, the numbers are fade-resistantHigh-quality material: sturdy, heavy-duty plastic construction, reliable material ensures durability. Wide Application: Perfect for basement, garage, barn, greenhouse, laboratories, kindergarten, room and more. No battery required: the thermometer is mechanical and not electronic, there is no battery to start dead, saving money and saving time for you. SpecificationTemperature Measurement Range: -10 ∽ 50°C / -20 - 50(°C)Measurement Error: 2(°C) Accuracy Class: 1.5Humidity Meter Range: 0-100%RHDeaching Accuracy: 1%Red Size: 257*92*25mm Blue Size: 300*105*30mmUser Manual1. A wet and dry bulb should be hung in a ventilated area to keep the tape and the pot of water clean.2. Pour water into the kettle below to clean and dip the yarn into the kettle before use.3. The humidity checked by this dry and wet bulb is calculated in degrees Celsius (°C). If the second meter is at the same temperature, it means that the water vapor in the air has reached the saturation point.4. The rotary calculation plate installed at the lower end of the wet bulb and dry bulb is a humidity and humidity comparison table to check the humidity in the air.5. Usage: according to the calculation of the wet and dry bulb temperature rotation, the dry bulb temperature linear scale should be raised using the wet bulb temperature scale. The reading number indicated by the direction of the arrow below is the relative humidity. Package Included:1*Hygrometer Thermometer for Dryness Measurement