data on the first and second pressure lines with said stored data application_number US 201213551765 A description while the making and using of various embodiments of the present invention are discussed in detail below it should be appreciated that the present invention provides many applicable inventive concepts that can be embodied in a wide variety of specific contexts the specific embodiments discussed herein are merely illustrative of specific ways to make and use the invention and do not delimit the scope of the invention to facilitate the understanding of this invention a number of terms are defined below terms defined herein have meanings as commonly understood by a person of ordinary skill in the areas relevant to the present invention terms such as u201c a u201d u201c an u201d and u201c the u201d are not intended to refer to only a singular entity but include the general class of which a specific example may be used for illustration the terminology herein is used to describe specific embodiments of the invention but their usage does not delimit the invention except as outlined in the claims referring now to the figure fig1 illustrates a schematic view of an apparatus for testing a hydraulic signature 10 apparatus for testing a hydraulic signature 10 includes fluid supply 12 first pressure line 14 second pressure line 16 and pressure recording device 18 pressure recording device 18 couples to first pressure line 14 and.