ZR Jar Tester is controled by microcomputer and monitor the motor by the digital signal instead of the traditional strap and gear which can decrease the malfunction greatly.. Stirring、Dosingand elevating function are controlled by three Printed Circuit Board(PCB) separately（dimension are 24×12, 14×10, 12×4cm）.We can solve most of the malfunctions by change the PCB(By Express) instead of repair visiting，which is both fast and cheap.