Optical Flatness Tester
Interferometric instrument measuring surface flatness of precision optical components and gauge blocks. Precision optical measuring instrument under HTS 9031.49.9000 for gauge and optical manufacturing.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If instruments specifically designed for optical flats
Dedicated optical flat measuring instruments have specific subheading.
If visual interferometers without quantitative measurement
Optical devices for qualitative inspection remain in 9013.
If high-precision gauge block comparators
Linear measuring instruments for length standards have specific provisions.
Not sure which classification is right?
Our AI classifier can analyze your specific product and recommend the correct HTS code with confidence.
Import Tips & Compliance
• Specify fringe interpretation method (Fizeau/Twyman-Green) and wavelength stability
• Include test plate material (fused silica/zerodur) and flatness specification
• Provide helium-neon laser stabilization documentation if applicable
Related Products under HTS 9031.49.90.00
Laser Surface Profilometer
A precision instrument using laser interferometry to measure surface roughness and topography on manufactured parts. Classified under HTS 9031.49.9000 as an other optical measuring instrument for quality control in precision engineering, not specified elsewhere in Chapter 90.
Optical CMM Coordinate Measuring Machine
Non-contact coordinate measuring machine using optical sensors and cameras for 3D dimensional inspection of complex geometries. Falls under HTS 9031.49.9000 as other optical measuring instruments for industrial metrology applications.
White Light Interferometer
Optical instrument measuring surface form and finish using white light interferometry for sub-micron precision. HTS 9031.49.9000 covers this advanced optical measuring technology used in semiconductor and optics manufacturing.
Telecentric Optical Comparator
Profile projector alternative using telecentric optics for distortion-free 2D measurement of small precision parts. Classified HTS 9031.49.9000 as other optical measuring instrument replacing traditional optical comparators.
Machine Vision Gauging System
Industrial camera-based system with telecentric lenses for automated dimensional inspection and defect detection. HTS 9031.49.9000 for optical measuring machines used in high-volume manufacturing quality control.
Conoscopic Holography Sensor
Compact optical sensor using conoscopic holography for 3D surface profiling and vibration analysis. Advanced optical measuring instrument under HTS 9031.49.9000 for R&D and production metrology applications.