Kelvin pliers - up to 30 mm opening. KC4: Kelvin clips (1 set = 2 pieces) for 4-pole connection of low-resistance test objects, cable length 120 cm, pliers for connections to test objects up to 30 mm Ø. The Kelvin clips connect low-resistance resistors (e.g. contact resistors, shunts, ...) to a resistance measuring device using four-pole technology. This compensates for the supply line resistance. KC4 consists of 1 pair of clamps. .