Simply insert an RCA or 1/4" coaxial cable through the Planet Waves Cable Cutter/Tester's feed hole, squeeze the cutting arm down, and you have a perfect, neat, clean cut. Once the cable is connected with the plugs, use the Cutter/Tester to check for shorts and proper tip and ground connections. Colored lights tell you if the cable is ready for use. If the blade on the cutting arm begins to dull, simply replace it with a regular razor blade.