OPUMETER is a handheld instrument, which is used to measure the spin finish content as OPU% directly on the running yarn after the spin finish nozzle. It may be used for POY and FDY and for any conductive spin finish composition. The yarn just has to be held between the ceramic pins of the instrument for some seconds in order to yield a real-time value of the present spin finish concentration. It is a relative measurement, referring to the conductivity of the spin finish on the passing yarn.

By means of this method, also short term deviations of the spin finish level due to air bubbles, faulty pumps or applicators may be detected and reacted to without any delay. OPUMETER offers a high degree of flexibility, both when it comes to location of use and results evaluation - it may be used at different production machines within short time. That way, it enables quick reactions to process malfunctions, with cost savings as a result.