What item might a Mail Clerk use to weigh packages?

A digital postal scale is specifically designed for weighing packages and letters accurately. It provides a precise measurement of weight, which is essential for determining postage costs and ensuring that the package complies with mailing regulations. This type of scale typically features a digital display that shows the weight, making it easy for the mail clerk to read and adjust the mailing cost accordingly.

In contrast, a balance scale, while it can measure weight, is typically used in laboratory or scientific settings rather than in a postal environment, as it may not be practical for everyday package weighing. A measuring tape is used for measuring dimensions rather than weight, and a ruler serves a similar purpose, focusing on linear measurements. Therefore, the digital postal scale is the most relevant and effective tool for a mail clerk in their duties.