The electrical-driven cap dresser as a mobile unit is a highly flexible, effective and uncomplicated addition to mobile electrode dressing technology. The special use and areas of application are hand guns for resistance spot welding technology in prototype construction. Analog to hand held, electrical-driven tip dressers, the enormous variety of our tip dressing inserts can be used in this device. The device highlights itself by very flexible horizontal and vertical adjustment options. The dressing tool can be easily rotated by 360° so that the gun tips can be dressed in any position. The flexible use of these mobile devices always offers a cost-effective alternative and enables the reduction of investment costs..