What assessment tool is used to determine the size of a wound?

The use of a measuring tape or ruler is fundamental in accurately assessing the size of a wound. This tool allows healthcare professionals to measure the length, width, and depth of the wound, which are critical components in evaluating the wound's condition, planning treatment, and monitoring healing progress over time. Precise measurements help in documenting the wound's status and can also inform decisions on interventions, such as the need for surgical intervention or the application of specific wound care products.

Other tools mentioned in the choices are not suitable for this specific purpose. A handheld flashlight is used for illuminating and visualizing areas, but it does not provide measurement capabilities. A stethoscope is designed for listening to internal body sounds, and it plays no role in wound assessment. A thermometer is utilized for measuring body temperature and doesn't assist in gauging the dimensions or characteristics of a wound. Thus, the measuring tape or ruler stands out as the correct tool for this assessment task.