Model: DS-75~100-SPThis model adopts Japan MIYACHI CT-110B Microcomputer Monitoring and Constant Current Resistance controller. Increased flexibility with 15 weld schedules. 3 control modes; Primary, Secondary Constant Current Feedback Control and Primary Voltage Fluctuation Compensation Control for reliable, high quality weld. Built-in current conduction degree and trouble monitor function. 3 easy-to-operate counters to aid in systematic quality control and tip dressing schedules.