Circuit breaker calibration screw

A circuit breaker comprising:

• a molded plastic case;
• a line stab and a terminal lug arranged within said molded plastic case to connect said circuit breaker to an external electrical power source and an external electrical load;
• a current path between said line stab and said terminal lug, wherein electrical continuity exists between the line stab and the terminal lug with said circuit breaker in a closed position;
• and
• a double headed calibration screw threaded into a threaded receptacle, wherein said calibration screw includes a threaded cylindrical body, a first end accessible from outside said molded plastic case and a second end located opposite said first end, wherein said first end and said second end have similar shapes, and further wherein said first and second ends each include tool engagement surfaces.