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A Wet & Dry Bulb Thermometer (Mercury Filled), also known as a Psychrometer, is a precision instrument used to measure ambient temperature and determine relative humidity by comparing the readings of a dry bulb and a wet bulb thermometer.
The dry bulb measures the surrounding air temperature, while the wet bulb has a cotton wick kept moist with water. Evaporation from the wet wick cools the wet bulb, and the temperature difference between the two bulbs is used to calculate relative humidity using a psychrometric chart or table.
Mercury provides excellent thermal conductivity, stable expansion, and highly accurate temperature readings over a wide range, making it suitable for precision measurement applications.
Mercury-filled thermometers are known for their high precision and typically provide an accuracy of approximately ±0.5°C to ±1°C, depending on the model and calibration.
No. A traditional Wet & Dry Bulb Thermometer does not display humidity directly. Relative humidity is determined by comparing the wet and dry bulb temperatures using a psychrometric chart or humidity table.
The wick should always be clean and kept moist with clean or distilled water. Replace it if it becomes dirty, damaged, or unable to absorb water effectively.
A Mercury-Filled Wet & Dry Bulb Thermometer is an excellent choice for applications requiring precise temperature measurements, dependable performance, and long-term stability in laboratories, environmental monitoring, and scientific research.
