A measuring aid is a tool used to measure length, width, or other dimensions. The three most common measuring aids are a RULER (5 letters), TAPE (4 letters), and RULE (4 letters). A RULER is a flat, straight object with markings that indicate measurements. TAPE is a flexible material with markings that indicate measurements. A RULE is a straight edge with markings that indicate measurements. All three of these measuring aids are used to accurately measure length, width, or other dimensions.