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The PA pressure Puffin® unique function is to measure reliably the manually controlled PA pressure and the resulting displacement relative to the adjacent vertebra. The computer program automatically calculates the stiffness quotient of the vertebra (i.e. the displacement/ pressure quotient) in Newton/mm; kg/mm or pounds/mm as selected. The user sees the force and displacement on the screen increase as the PA pressure test is performed in figures and as a graph. See video to the left. The user has full control over the pressure applied and can respond to the clients reactions during the test.