The circuit resistance tester utilizes advanced digital switch-mode power supply technology, capable of directly generating a DC current output of 100A/200A (for the 200A model) to the circuit under test. It measures the contact resistance of the circuit using the 4-wire method and displays the test results directly on the instrument's LCD screen. All test results can be printed using the instrument's built-in mini printer. The test results can also be saved in the instrument's memory, which can store up to 100 sets of data. The stored test results can be uploaded to a PC for preservation via the RS232 interface.