Divinext Wet & Dry Zeal Bulb Zeal Hygrometer Relative Humidity Meter Moisture Meter Room Hanging Temperature Gauge Meter Weather Station Analogue Two Scales Mercury Thermometer  (Yellow)

Used to calculate the water vapor content (relative humidity) of air at a given temperature. It has two basic mercury thermometers, comprising of a wet bulb & dry bulb respectively. The wet bulb thermometer has its bulb wrapped in a tight fitting muslin cloth material (wicking) which is soaked in water. When the thermometers are ventilated, the wet bulb temperature will be lower than the dry bulb temperature. Subtracting the wet bulb reading from the dry bulb reading yields the Wet Bulb Depression. The relative humidity can now be read from the table provided.