Thermo Hygrometer
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Thermo Hygrometer

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A Thermohydrometer is a specially designed hydrometer that is used for measuring specific gravity or the relative density of crude oil and petroleum products. There are various types of hydrometers used for measuring the specific gravity of the liquids; however, thermohydrometers are only used in the petroleum industry. This hydrometer is similar to a thermometer and consists of a cylindrical stem and a weighted bulb thus makes it float upright when used for measurement of specific gravity.