Measures ac current from 1A to 600A. Output to meter is 1mA/Amp ac. (Division ratio is 1000 to 1.) Maximum conductor size 2" (50 mm) in diameter. New straight, safety-shrouded plugs. Accuracy: ¤2%, 50 Hz to 1 kHz, ¤3% (typical) 30 Hz to 50 Hz or 1 kHz to 10 kHz. (Factory Mutual Approved).