The Casella Whirling Hygrometer Sling Sychrometer Dual Thermometer is a scientific instrument designed for measuring the humidity and temperature of the atmosphere. This hygrometer spirometer is a valuable tool for professionals in various industries and is a sought-after collectable for enthusiasts of scientific instruments. Made in the United Kingdom, this dual thermometer is a reliable and accurate instrument that provides essential data for climatological studies and research.
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