What best characterizes a calculator used as a "counter"?

A calculator used as a "counter" primarily functions as a tool that tracks repeated occurrences. This means that it counts items, events, or any type of occurrence that needs to be tallied in a systematic way. For example, a counting calculator can be used to keep track of how many people enter a venue, how many times a specific action is performed, or any other repetitive task that requires a numerical count.

This counters the possibility of using the calculator for writing complex equations, running simulations, or measuring distances, which are functions beyond simple counting. Each of those other functions would require a different type of calculator or device, emphasizing that the primary aim of a counter calculator is straightforward counting rather than complex calculations or measurements.