The thermo-hydrometer is an instrument equipped with a gravimeter (thermometer and hydrometer) that is used to verify the density of the LPG product stored in the tanks, through the simple and safe sampling of the product inside a test cylinder, tested and certified for working pressures of up to 18 bar.

The gravimeter inside floats when a small amount of the product to be checked is inserted and enables the product density and temperature to be read, and by referring to the ANSI table supplied with the device the product composition can be identified with the greatest precision.
The product identification may be requested from either the Authorities (such as the Customs and Excise Department), or by the owners to check the product on delivery from the refinery when specific product orders are given (minimum Propane or maximum Butane content).