COVAFIL+ with its new capacitive sensor design and a high-speed yarn twister fulfills all requirements of an effective and reliable quality control. The tester determines CV% and U% values at various cut lengths including half-inert and inert values and provides spectrograms and length-variation curves, too. The concept to operate the COVAFIL+ either as a stand-alone unit or in combination with Textechno’s well-proved filament yarn testers DYNAFIL ME+ and COMCOUNT provides highest testing efficiency and flexibility.