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SITCSection 8
U.S. imports of hydrometers, thermometers, pyrometers, barometers, hygrometers, and psychrometers (SITC 87455) totaled $81.5M in April 2026, traded with 68 countries.
Importers of Hydrometers, Thermometers, Pyrometers, Barometers, Hygrometers, and Psychrometers paid $6.8M in duties in April 2026 — an effective duty rate of 13% on $54.0M in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: April 2026 dataLiquid-in-glass thermometers, digital pyrometers for high-temperature industrial processes, aneroid and mercury barometers, and humidity-measuring hygrometers and psychrometers are all captured within this heading, which also encompasses combination instruments integrating two or more of these measurement functions. The diversity of end-use sectors — from HVAC and meteorology to food processing and laboratory science — means that the specific measurement principle and construction (e.g., bimetallic vs. resistance thermometer, floating vs. electronic hydrometer) are the primary classification anchors. Combination instruments are classified here when the combined functions are all drawn from the listed instrument types.
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A combination instrument that measures both temperature and humidity falls within this heading because both functions (thermometer and hygrometer/psychrometer) are explicitly listed. The heading specifically covers any combination of the enumerated instrument types, so a dual-function device does not need to be split between headings.
A hydrometer is a floating instrument that measures the density or specific gravity of a liquid; a hygrometer measures atmospheric humidity. Both are covered by this heading, but they operate on entirely different physical principles. Misidentifying one for the other is a common documentation error — the instrument's function, not its name, controls classification.
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Monthly import values over time