Valhalla offers the option "C1000" along with the Valhalla 2555A, to make the calibration of clamp-on ammeters, current transformers, and a variety of current sensor (magnetic field based) devices a simple task. The basic principle envolves the 2555A driving 100 amps per turn into a 10 turn coil. The Valhalla 2555A Current Calibrator can easily drive the ten turn option "C1000" and simulate 1000 amps. By placing the clamp-on ammeter around and thru the windings of the "C1000" the clamp-on meter under test can be verified for accuracy, and frequency response.