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The Off-Line Profilometer (Profilometer) is an instrument that uses laser technology to measure the top and bottom profiles of tire tread and sidewall extrusions. The Profilometer is used in die shops to verify the profile and approve the die for production. The Profilometer is also used on the shop floor at the extruder as a periodic, quality checking system for the extruded profile.

A typical Profilometer test is done by placing a short section of the extruded profile in the instrument and making an automatic scan. The instrument scans the top and bottom profiles, displays the profile superimposed on a template file, extracts key parameters, and compares them to allowable limits. Parameters include the geometric coordinates of all break points in the profile. The die maker can then adjust the die to bring the actual extruded profile into specification and then retest. Once the die is in production many users take periodic samples to verify that the process has not drifted out of specification.