HS Code 9025 — Thermometers and Hydrometers

This category covers instruments that measure temperature, atmospheric pressure, and moisture content in air or liquid. This includes standard wall thermometers, barometers for weather, and hydrometers for liquid density.

What's included

Liquid-in-glass thermometers
Digital pyrometers
Aneroid barometers
Humidity sensors (hygrometers)
Alcoholometers

What's excluded

Medical thermometers → use 902519 (While in the same heading, clinical thermometers have specific sub-codes and regulations.)
Thermostats → use 9032 (Devices that proactively control temperature are classified under 9032.)

Common examples

Infrared non-contact thermometer
Mercury-filled glass thermometer
Digital hygrometer for humidors
Wireless weather station barometer

Frequently asked questions

Are smart home temperature sensors under 9025?

Yes, if they primarily measure and display temperature. If they act as a gateway for a control system, classification might differ.

Trade & shipping notes

Typical duty range: 0% - 3%
Documentation: Mercury-containing products are strictly regulated and banned in many jurisdictions under the Minamata Convention.
Typical shipping mode: Air
Top exporters: China, Germany, Japan
Top importers: United States, Germany, India

Key takeaway

Differentiate between thermometers that only measure (9025) and those that control systems (9032).

Thermometers and Hydrometers