This study proposed an adaptive front-end readout circuit design for high resolution magnetic scales. The demonstration will provide the operation of magnetic scales, that can show the amount of displacement of magnetic scales by FPGA module. The adaptive front-end circuit can be sense three kind of input gain with FPGA module via magnetic scales movement. In the further, the visitors can experience and understand working principles of high resolution magnetic scales. The paper submit was accepted from 2015 IEEE Sensors conference, that paper ID is 1201.