... in China Description:DC circuit breaker tester set is used for mechanical characteristic test of ... measure the contact open distance,-Be able to test and display the gap wave form, bouncing amplitude, bounce ... for CB O/C and DC motor, 1 set-Signal cable connecting to sensor,1 set, with two sensor ... ,another is angular displacement-Senor universal Clamp, 1 set -Power input cable, 1 piece-Grounding cable, ...