Figure 2
From: In vitro hydrodynamic properties of the Miethke proGAV hydrocephalus shunt

Shapes of pressure-flow curves for the three shunts tested at three different pressure settings: 4 cm H2O, 10 cm H2O and 16 cm H2O (left to right). The pressure units used for these measurements were mm Hg. However the manufacturer used cm H20 for the settings on the shunts.