Due to its special function, shunt resistor should be used in precision electronic products, such as instruments, meters, and measuring equipment. Special attention should be paid to the selection of resistance accuracy. If the accuracy is not enough, the current size of the shunt may be too different from the expected value. This directly leads to a large error in the measurement result and loses the meaning of the measurement. In the same way, other precision electronic products must be carefully selected due to their high requirements.