MLS WG 25,50,100,200/2.5 CAT III 4mm Measuring Leads. Hirschmann Test and Measurement MLS WG 4mm CAT III measuring leads have a 4mm diameter safety connector with a straight outlet one end and an 90 degree angled connector on the other. These measuring and test leads have a nickel plated copper beryllium contact spring, highly flexible,double insulated stranded lead and a shatter-proof sleeve. The test lead cable has a built in colour indicator for easy identification of insulation damage by means of a different coloured inner core of insulation. Rated voltage 1000 VAC/DC Rated current 32A CAT III PVC Insulated 100cm in length Wire stranding 320 x 0.10mm Contact resistance 12 m