Which term describes an instrument used to record?

The term that best describes an instrument used to record is "graph." In the context of medical terminology and instrumentation, a graph serves as a means to visually represent data or measurements taken by an instrument. For example, a graph might illustrate medical data trends, such as heart rate variability or blood pressure over time, which can aid in the analysis and interpretation of a patient’s health status.

While the other terms have meanings related to measurement or examination, they do not specifically refer to an instrument for recording data in the same way that a graph does. For instance, "meter" typically refers to a device that measures a specific quantity, though it doesn’t inherently imply recording. "Scopy" refers to the examination of internal structures using an endoscope, which is more about observation than recording. "Tomy" indicates cutting or incision but does not pertain to the documentation aspect. Thus, "graph" is the most suitable term for recording data and information visually.