If the terminal's principal function is recording the time of day for attendance purposes and it incorporates a clock or synchronous-motor timekeeping element, 910610 (time registers and time-recorders) is the appropriate subheading. However, if the device is primarily a data-processing terminal or biometric reader that incidentally logs timestamps, it may classify in Chapter 84 or 85. The principal-function analysis and the presence of a qualifying timekeeping mechanism are the key classification factors.

A handheld stopwatch worn or carried as a personal timepiece — particularly one with a precious or base-metal case — would typically fall under heading 9101 or 9102 depending on case material. Heading 9106 is directed at apparatus designed to measure or record time intervals in a commercial or industrial context, often fixed or semi-fixed installations. A professional sports-timing system with a synchronous-motor or clock-movement base would be more naturally classified under 9106, while a personal stopwatch watch goes to 9101 or 9102.