9031 - Measuring or checking instruments, appliances and machines, not specified or included elsewhere in this chapter; profile projectors; parts and accessories thereof:

Sub-classifications

Commodity Code

Description

9031 1000 00

Machines for balancing mechanical parts
9031 2000 00

Test benches
Other optical instruments and appliances:
- 9031 4100
  
  For inspecting semiconductor wafers or devices (including integrated circuits) or for inspecting photomasks or reticles used in manufacturing semiconductor devices (including integrated circuits)
  - 9031 4100 20
    
    For inspecting photomasks or reticles used in manufacturing semiconductor devices
  - For inspecting semiconductor wafers or devices:
    
    9031 4100 40
    
    For wafers
    
    9031 4100 60
    
    Other
- 9031 49
  
  Other:
  - 9031 4910 00
    
    Profile projectors
  - 9031 4940 00
    
    Coordinate-measuring machines
  - 9031 4970 00
    
    For inspecting masks (other than photomasks) used in manufacturing semiconductor devices; for measuring surface particulate contamination on semiconductor devices
  - 9031 4990 00
    
    Other
9031 80

Other instruments, appliances and machines:
- 9031 8040 00
  
  Electron beam microscopes fitted with equipment specifically designed for the handling and transport of semiconductor wafers or reticles
- 9031 8080
  
  Other
  - Equipment for testing the characteristics of internal combustion engines:
    
    9031 8080 60
    
    For testing electrical characteristics
    
    9031 8080 70
    
    Other
  - 9031 8080 85
    
    Other
9031 90

Parts and accessories:
- 9031 9021 00
  
  Of profile projectors
- Of other optical instruments and appliances, other than test benches:
  - 9031 9045 00
    
    Bases and frames for the coordinate-measuring machines of subheading 9031.49.40
  - 9031 9054 00
    
    Of optical instruments and appliances of subheading 9031.41 or 9031.49.70
  - 9031 9059 00
    
    Other
- Other:
  - 9031 9070 00
    
    Of articles of subheading 9031.80.40
  - 9031 9091
    
    Other
    
    9031 9091 30
    
    Of machines for balancing mechanical parts
    
    9031 9091 60
    
    Of test benches
    
    9031 9091 95
    
    Other

Overview

HTS Code 9031 encompasses a broad range of measuring, checking, and testing instruments, appliances, and machines that are not specifically classified elsewhere in Chapter 90. This category is designed to capture precision equipment used for verification, calibration, or inspection, often employing optical, mechanical, or electronic principles. Examples include devices for measuring dimensions, angles, surface irregularities, and force, as well as instruments for material testing and quality control. The key distinguishing feature is their primary function of measuring or checking, differentiating them from instruments primarily used for diagnosis (e.g., medical instruments) or for generating outputs (e.g., recording devices).

This heading serves as a residual category within Chapter 90 for instruments with a measuring or checking function not covered by more specific headings like 9017 (drafting, surveying, etc.) or 9024 (testing of hardness, strength, etc.). The inclusion of "profile projectors" specifically highlights optical instruments designed for magnified visual inspection of object profiles. The broad scope of 9031 necessitates careful consideration of the intended use and operational principle of an instrument to ensure correct classification.

Within HTS 9031, several subcategories provide further specificity. Machines for balancing mechanical parts (9031.10) are dedicated to ensuring rotational symmetry and stability. Test benches (9031.20) are designed to subject other machinery or components to controlled conditions for testing and performance evaluation. The category also includes "other optical instruments and appliances" that do not fit into more specialized optical headings, alongside "other instruments, appliances and machines" not otherwise specified. Finally, provisions for "parts and accessories" (9031.90) ensure that components specifically designed for these measuring and checking devices are appropriately classified.

Go up to Chapter 90: Optical, photographic, cinematographic, measuring, checking, precision, medical or surgical instruments and apparatus; parts and accessories thereof

9031 - Measuring or checking instruments, appliances and machines, not specified or included elsewhere in this chapter; profile projectors; parts and accessories thereof:

Sub-classifications

Overview

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