The PVLEAD1 is a set of black and red MC4 to 4mm adapter test leads. The red cable is an MC4 plug to a 4mm banana plug test lead, and the black cable is an MC4 socket to a 4mm banana plug test lead. It ensures safe current and voltage measurements of photovoltaic (PV) modules and systems. Connect measuring devices to PV power plants for regular testing, measurements, and troubleshooting of PV solar modules.