Set of 3 clamp probes with 24" (600mm) perimeter. PQ34-30 is a set of 3000-Amp flexible current probes for PQ3450/PQ3470 power quality analyzers. 24 in. (600 mm) for wrapping around bus bars and wire bundles. Switch between 3 ranges; 3000-amp, 300-amp, 30-amp.