Chauvin Arnoux P01295521 Insulation Tester HV Test Lead Set (Blue). The Chauvin Arnoux crocodile leads are intended for use with a meghommeter or a dielectric meter. These leads are rated for 10A, but the piggyback jacks are limited to 15mA. The piggyback jack of the black lead is connected to the internal braid (shielding). The piggyback jack of the blue lead (0.3m or 0.5m) is connected to the core of the lead. The clamping capacity of crocodile clips is diameter from 1 to 34mm or 12mm bar.