Other
Measuring or checking instruments, appliances and machines, not specified or included elsewhere in this chapter; profile projectors; parts and accessories thereof: > Parts and accessories: > Of other optical instruments and appliances, other than test benches: > Other
Duty Rate (from China)
Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
Except as provided in headings 9903.88.05, 9903.88.06, 9903.88.07, 9903.88.08, 9903.88.10, 9903.88.11, 9903.88.14, 9903.88.19, 9903.88.50, 9903.88.52, 9903.88.58, 9903.88.60, 9903.88.62, 9903.88.66, 9903.88.67, 9903.88.68, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(a) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(b) [to this subchapter]
Products classified under HTS 9031.90.59.00
Profile Projector Screen Reticle
Precision-etched glass reticle mounted in profile projector screens for measurement reference. Falls under HTS 9031.90.59.00 as accessory for optical checking instruments. Provides standardized scale for direct magnified measurement readout.
Fiber Optic Light Guide Bundle for Microscopes
Flexible coherent fiber bundle transmitting illumination to measuring microscope workpieces. Classified HTS 9031.90.59.00 as accessory for other optical measuring instruments. Maintains light intensity uniformity for consistent measurements.
Calibration Test Gage Block Holder
Precision kinematic mount holding gage blocks under optical microscopes for calibration verification. HTS 9031.90.59.00 covers this measuring instrument accessory. Ensures accurate positioning during length standard comparisons.
Interferometer Mirror Mount Assembly
Kinematic mirror mount for laser interferometer reference mirrors in length measuring systems. Falls under HTS 9031.90.59.00 as part for other optical measuring appliances. Provides sub-arcsecond alignment stability.
Autocollimator Objective Lens Cell
Precision cell housing objective lens assembly for autocollimator angle measuring instruments. HTS 9031.90.59.00 as part for other optical checking appliances. Thermal compensation design maintains alignment stability.
Optical Encoder Scale Reader Head
Compact read head assembly for glass or steel scale linear encoders in measuring instruments. Classified HTS 9031.90.59.00 as accessory for optical position checking systems. Provides 0.1 micron resolution position feedback.
Measuring Microscope Eyepiece Micrometer
Calibrated reticle eyepiece with filar micrometer for direct visual measurement in measuring microscopes. HTS 9031.90.59.00 as part for other optical measuring instruments. Provides 0.001mm measurement precision.
Non-Contact Surface Profilometer Probe
Optical chromatic confocal probe for non-contact surface roughness measurement systems. Falls under HTS 9031.90.59.00 as part for other optical checking instruments. Achieves nanometer-level surface texture analysis.
Laser Alignment Bracket for Optical Profile Projectors
This precision-machined aluminum bracket is designed to hold and align laser sources with optical profile projectors used in quality control measurements. It falls under HTS 9031.90.59.00 as a part specifically for other optical measuring instruments not elsewhere specified in Chapter 90. The bracket ensures accurate positioning during non-contact dimensional inspections.
LED Illuminator Module for Coordinate Measuring Machines
High-intensity LED module providing uniform backlighting for coordinate measuring machines (CMMs) with optical sensors. Classified under HTS 9031.90.59.00 as an accessory for other optical checking instruments in this chapter. Essential for silhouette edge detection in precision metrology applications.
Precision Stage Micrometer Calibration Slide
Glass slide with chrome-deposited precision scale pattern used to calibrate microscope stages and optical measuring microscopes. Falls under HTS 9031.90.59.00 as an accessory for other optical measuring instruments. Provides traceable accuracy verification for dimensional measurement systems.
Telecentric Lens Mount for Optical Comparators
Adjustable mount assembly for telecentric lenses in optical comparators used for profile projection and measurement. HTS 9031.90.59.00 covers this as a part for other optical measuring appliances. Provides distortion-free imaging critical for accurate part inspection.
Digital Readout Interface Cable for Metrology Instruments
Specialized shielded cable assembly connecting optical encoders to digital display units in measuring instruments. Classified HTS 9031.90.59.00 as accessory for other Chapter 90 optical checking appliances. Ensures noise-free signal transmission for precise measurements.
Optical Edge Detection Sensor Head
Compact sensor head using laser triangulation for edge detection in automated optical measuring systems. HTS 9031.90.59.00 as part of other measuring optical instruments. Provides sub-micron resolution for contour tracing applications.
Motorized XY Stage Controller for Optical Gages
Electronic control unit for precision motorized XY positioning stages in optical thread gages and similar. HTS 9031.90.59.00 as part for other optical measuring appliances. Enables automated scanning and measurement sequencing.