Product classification
HS code for Calibration weights: 8423.90
Weighing machines, weights of all kinds, parts of weighing machinery.
Classification of calibration weights under HS 8423.90
Calibration weights are classified under Harmonized System (HS) code 8423.90. This classification falls within Chapter 84, which covers "Nuclear reactors, boilers, machinery and mechanical appliances; parts thereof." Heading 8423 specifically addresses "Weighing machinery (excluding balances of a sensitivity of 5 cg or better), including weight-operated counting or checking machines; weighing machine weights of all kinds." Subheading 8423.90 is designated for "Weighing machine weights of all kinds; parts of weighing machinery." Calibration weights are essential for ensuring the accuracy and precision of weighing instruments, making them directly classifiable under this subheading as either "weights of all kinds" or "parts of weighing machinery" due to their integral role in the functionality and maintenance of weighing equipment.
- Covers
- Standard weights for scales
- Test weights for balances
- Precision calibration weights
- Laboratory weights
- Weight sets for calibration
- Reference weights for industrial scales
- Also under 8423.90
- Mettler Toledo Load Cells
- Sartorius Calibration Weights
- Ohaus Weighing Platforms
- Rice Lake Weighing Systems Indicators
- A&D Company Scale Parts
Codes often confused with 8423.90
Common mistake. Common misclassifications for calibration weights often involve confusing them with complete weighing instruments or general metal articles. HS 9016.00 covers "Balances of a sensitivity of 5 cg or better, with or without weights." This code is for the complete high-precision balances themselves, not the separate weights used for their calibration. While calibration weights might be made of iron or steel, classifying them under HS 7326 ("Other articles of iron or steel") would be incorrect because their specific function as weights for weighing machinery takes precedence over their material composition. HS 8423.10, which covers "Personal weighing machines, including baby scales; household scales," refers to specific types of weighing machines, not the weights used to calibrate them. The functional specificity of calibration weights is key to their correct classification under 8423.90.
Top exporters and importers of HS 842390 (the code used for calibration weights), 2025
In 2025, the largest exporter of HS 842390 (the code used for calibration weights) in UN Comtrade data was China, with 27% of world exports; the largest importer in UN Comtrade data was the United States, with 11% of world imports. Countries that did not report 2025 data are estimated from partner records, which can understate them.
Figures cover everything classified under HS 842390, not only calibration weights.
Top exporters 2025 · share of world exports
- 1 China $279M 27% of world exports
- 2 Germany $125M 12% of world exports
- 3 United States $69M 6.7% of world exports
World total: $1.0B Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 United States $121M 11% of world imports
- 2 Germany $65M 6.1% of world imports
- 3 Indonesia $62M 5.9% of world imports
World total: $1.1B Reported figures on UN Comtrade ↗
How these figures are built
109 countries reported 2025 trade to UN Comtrade in HS 2022, and their own totals are used. Countries that did not report are estimated from what other countries recorded trading with them. Those estimates miss trade with other non-reporting countries, so they can be low, and a non-reporting country can rank higher than shown or be missing from the list. World totals add both and leave out trade between two non-reporting countries. Figures are in current US dollars; reported imports are mostly valued CIF and exports FOB, and exports include re-exports. The UN Comtrade links show the underlying records; they can also list a few reporters left out here (regional groups and older HS editions).
Source: UN Comtrade (United Nations Statistics Division), 2025 annual data.
Brazil NCM codes for calibration weights
Brazil splits HS 8423.90 into 3 NCM codes. Pick the one that matches your product:
- 8423.90.10Weights for all kinds of balances
- 8423.90.21Parts of personal and household scales
- 8423.90.29Other parts of weighing machinery
Source: Siscomex NCM table, updated Oct 2026. The Portuguese text on each NCM page is the official one.
Questions about calibration weights
What is the HS code for Calibration weights?
The HS code for Calibration weights is 842390 (Weighing machines; weights of all kinds, parts of weighing machinery). The HS code for calibration weights is 8423.90.
How do I classify Calibration weights for customs?
Calibration weights is classified under HS code 842390 — Weighing machines; weights of all kinds, parts of weighing machinery. This is a 6-digit subheading level code.
Are all weights classified under HS 8423.90?
No, HS code 8423.90 specifically includes "weights of all kinds" when they are intended for use with weighing machinery. This distinguishes them from weights used for other purposes, such as exercise weights (e.g., dumbbells, barbells), which are typically classified under Chapter 95 as articles for sports or physical exercise, or counterweights for machinery, which might fall under other headings depending on their specific application.
Which countries are the top exporters of calibration weights (HS 842390)?
In 2025, the top exporters of HS 842390 (the code used for calibration weights) in UN Comtrade data were China ($279M, 27% of world exports), Germany ($125M) and the United States ($69M). World exports came to about $1.0B, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.
Which countries are the top importers of calibration weights (HS 842390)?
In 2025, the top importers of HS 842390 (the code used for calibration weights) in UN Comtrade data were the United States ($121M, 11% of world imports), Germany ($65M) and Indonesia ($62M). World imports came to about $1.1B, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.
Is the HS code for Calibration weights the same in all countries?
The base HS code 842390 for Calibration weights is internationally standardized for the first 6 digits across 200+ countries. Individual countries may add additional digits for national tariff lines and specific classifications.
What is the NCM code for calibration weights in Brazil?
Brazil splits HS 842390 into 3 NCM codes, so the right one for calibration weights depends on the product's details: 8423.90.10 (Weights for all kinds of balances), 8423.90.21 (Parts of personal and household scales), 8423.90.29 (Other parts of weighing machinery).