Conventional screw fastening work often relies on the experience and intuition of the worker, who determines if the screw has been fastened correctly. Thus, the quality depends on the skills of the individual. To keep consistent fastening quality regardless who does it, automation and digitalization is the most effective way, and it becomes possible with this JUKUREN. By reading the signals transmitted from the motor and checking the number of pulses, the screwdriver itself judges the screw’s seating condition that is barely detected with a visual check. As a result, anyone can efficiently perform proper screw fastening.