All manufacturing part numbers ending in 7** are gold plated variants. MLN 2.5 Stackable 4mm Measuring Leads. Hirschmann Test and Measurement MLN 2.5, 4mm measuring leads have at either end a 4mm diameter plug with caged spring and 4mm diameter socket for tower construction. These measuring and test leads have a nickel or gold 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 30 VAC / 60 VDC Rated current 32A CAT I PVC Insulated Wire stranding 320 x 0.10mm Contact resistance 12m (100cm) 20m (200cm)