kymograph

An instrument for recording variations in pressure, as of the blood, or in tension, as of a muscle, by means of a pen or stylus that marks a rotating drum.

An instrument by means of which variations of fluid pressure, as of the blood in some one of the vessels of a living animal, can be measured and graphically recorded.

An instrument for measuring, and recording graphically, the pressure of the blood in any of the blood vessels of a living animal; — called also kymographion.

A device that gives a graphical representation of a variation in a phenomenon such as blood pressure over time, using a pen on a rotating drum.

scientific instrument consisting of a rotating drum holding paper on which a stylus traces a continuous record (as of breathing or blood pressure)