9902.17.40 - Signal generators, certified by the importer to be used for calibrating radio frequency measurement equipment, each presented without a recording device (provided for in subheading 9030.89.01)

This HTS classification, 9902.17.40, pertains to specialized signal generators. The key defining characteristic is the importer's certification that these devices are exclusively for calibrating radio frequency (RF) measurement equipment. Furthermore, a crucial stipulation for this classification is that the signal generators must be presented *without* any integrated recording device. This ensures they are solely employed for their intended measurement calibration purpose and are not multifunctional recording units.

While the broader HTS structure encompasses a vast array of goods from live animals to machinery, this particular subheading exists within Chapter 99, which is reserved for temporary legislation and special provisions. Therefore, its direct siblings are not typically goods of a similar nature but rather other special or temporary tariff items. The uniqueness of 9902.17.40 lies in its specific application and the import certification requirement, distinguishing it from general-purpose signal generators that might fall under other HTS chapters (such as Chapter 90 for optical, photographic, or medical apparatus) and lack the specific calibration use and certification.

As this HTS code represents a leaf node, there are no further subcategories beneath it. This means that any signal generator meeting the description and certification requirements will be classified directly under 9902.17.40. The classification relies heavily on the importer's affirmative declaration regarding the intended use for RF measurement calibration and the absence of a recording mechanism, as these are the primary criteria for eligibility.