A simple gauge for measuring waterside pit depths can be made using a card of which size?

The optimal size for a simple gauge used to measure waterside pit depths is a 3x5-inch card. This size is practical for several reasons. First, a 3x5 card is large enough to be easily readable but compact enough to handle conveniently. It provides sufficient surface area for markings or measurements without being cumbersome. Additionally, the dimensions allow the gauge to fit easily into typical work environments, making it user-friendly when precise measurements are required, such as in a marine or machinist setting. This balance of size contributes to its effectiveness as a tool for quick assessments in the field.