BALRAMA Zeal Wet and Dry Bulb Hygrometer / Psychrometer Mason's Type by ZEAL England P501 C+F PSYCHROMETER -20° to 50°C Wet & Dry Bulb Hygrometer Humidity Temperature Meter Tester Pinless Analog Moisture Measurer(50 mm)
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-10 D Cel To 50 D Cel Wall Mounted 100% Relative Humidity Height 320mm, Width 40mm, Length 80mm. Yellow Colour Or Plastic Body. Hygrometer is an instrument used for measuring the amount of humidity in the atmosphere. It has two basic mercury thermometers, comprising of a wet bulb & dry bulb respectively. Evaporation from the water on the wet bulb drops down the temperature which makes is display, causing it to lower temperature as compared to dry bulb.