This system consists of a low-resistance tester matched with a multi-channel matrix switch. The main unit adopts the 4-wire Kelvin test method, which can accurately measure micro-ohm level small resistances. The number of system channels can be flexibly configured according to optional matrix modules, with 30-channel, 90-channel and 150-channel models available. Each terminal of the equipment is clearly marked with the channel number for fast wiring and measuring point identification.