9025.80.35.00 - Hygrometers and psychrometers, non-recording

This HTS classification, 9025.80.35.00, specifically covers hygrometers and psychrometers that are not designed for automatic recording of measurements. Hygrometers are instruments used to measure the amount of water vapor in the air, indicating humidity. Psychrometers, a type of hygrometer, typically utilize two thermometers – one dry bulb and one wet bulb – to determine humidity based on the difference in their readings. These instruments are essential for a wide range of applications, from environmental monitoring and meteorological studies to industrial processes and climate control systems.

It is important to distinguish these non-recording hygrometers and psychrometers from other instruments within the 9025.80 category. Unlike barometers (9025.80.15.00), which measure atmospheric pressure, or hydrometers (9025.80.20.00), which measure the specific gravity of liquids, this category is solely focused on humidity measurement. Furthermore, these non-recording devices are distinct from thermographs, barographs, and hygrographs (9025.80.40.00), which automatically record data over time. The key differentiating factor is the absence of a recording mechanism.

As this HTS code represents a leaf node, there are no further subcategories under 9025.80.35.00. Classification at this level signifies that the instrument's primary function is non-recording humidity measurement, and it does not fall under any more specific subdivisions for combined instruments or other specialized types of hygrometers and psychrometers. Therefore, any instrument fitting the description of a hygrometer or psychrometer, that does not record, and is not otherwise classified, will fall under this heading.