9902.17.35 - Impedance analyzers, having a frequency range of 20 Hz to 120 MHz and plus or minus 42 V peak maximum output, each with 1 to 4 measurement channels, a recording device and a color touch screen measuring over 25 cm but not over 28 cm (provided for in subheading 9030.84.00).

This HTS category, 9902.17.35, specifically covers imported impedance analyzers that meet a defined set of technical specifications. These instruments are designed for electrical measurements, featuring a broad frequency range from 20 Hz to 120 MHz and a peak output voltage tolerance of plus or minus 42 V. Key functional attributes include the presence of 1 to 4 measurement channels, an integrated recording device, and a color touch screen with a screen diagonal measuring between 25 cm and 28 cm. This detailed description ensures precise identification and prevents misclassification of similar but less specialized equipment.

As this is a leaf node within Chapter 99, it does not possess further subcategories. Instead, its classification is determined by its precise technical parameters as outlined in the description. The provision "provided for in subheading 9030.84.00" indicates that these specific impedance analyzers are temporarily modified or subject to special provisions under the Harmonized Tariff Schedule, likely due to trade agreements or temporary legislation. This designation distinguishes them from standard instrumentation classifications that might otherwise fall under Chapter 90, emphasizing their unique regulatory status.

The parent context, Chapter 99, signifies that this entry is part of temporary legislation or modifications related to trade agreements and agricultural adjustments. Therefore, the impedance analyzers classified under 9902.17.35 are subject to special rules beyond standard tariff classifications. Their placement in this chapter highlights that their import may be influenced by specific trade policies, quotas, or duties that differ from those applied to general scientific instruments.