The manometer?

The manometer.

Watch this manometer.

Van Slyke-Neill gas manometers, sir, Doctor.

- Jill, you hold the manometer. - Mm-hmm.

Van Slyke gas manometers, sir, Doctor.

Those are Van Slyke-Neill gas manometers over there.

Those are Van Slyke gas manometers over there.

The mercury sphygmomanometer uses a column of mercury (manometer) to provide the pressure readout.

The manometer typically reads from 0 to 300 millimeters of mercury.