may be cylindrical and need not be conically tapered holding fixtures 420 may be adapted to accommodate such variations in workspace 425 system 400 further includes a plurality of measuring devices 430 positioned to measure the interior of the workspaces 425 while five measuring devices 430 are shown any number of measuring devices 430 may be used each measuring device 430 contains a respective plunger 435 to which a respective contact element 440 is coupled measuring devices 430 are capable of extending plungers 435 so that contact element 440 touches workspace 425 once contact element 440 has reached a maximum amount of extension into workpiece 425 measuring device 430 can measure an amount of extension each contact element 440 can of a different size than the other contact elements 440 so long as two or more differently sized elements are provided contact elements 440 are preferably spherical however they may be any shape capable of fitting into a sleeve cone including but not limited to hemispherical and conical so long as they have a circular cross section for contacting circular a cross section of the workpiece into which such elements 440 will extend the amount of extension may be used as indicia of the position of the contact element 440 in the workpiece 425 these indicia of position may be viewed or otherwise interpreted into a height of the contact element 440 with respect to a reference each measuring device 430 may be controlled by a gauge controller that controls the amount of extension of each.