9025.80.40.00 - Thermographs, barographs, hygrographs and other recording instruments

This HTS classification covers thermographs, barographs, hygrographs, and other recording instruments designed to measure and automatically record environmental or process parameters over time. These instruments are distinguished from their non-recording counterparts by their inherent capability to continuously chart data, such as temperature (thermographs), atmospheric pressure (barographs), or humidity (hygrographs). The "other recording instruments" designation is broad and would encompass devices that record other measurable variables not specifically listed, provided they are designed for automatic recording.

Unlike sibling categories such as barometers (9025.80.15.00), non-recording hydrometers (9025.80.20.00), or non-recording hygrometers/psychrometers (9025.80.35.00), the primary defining feature of goods under 9025.80.40.00 is their automatic recording function. While these other categories may measure similar parameters, they lack the mechanism for continuous data logging. This category does not have further subdivisions, representing the final level of detail for these specific types of recording instruments within the HTS.