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For calibrating ground bond resistance meters, portable appliance testers and similar instruments, the Fluke 5320A Multifunction Electronic Tester Calibrator is equipped with high-power rated resistors at 16 fixed points ranging from 25 mΩ to 1.8 kΩ. The best accuracy for these resistors ranges from ± 5 mΩ to ± 8 mΩ, and applies for the resistances below 500 mΩ.