Magnaflux Quick-Break Tester / Shot Timer Magnaflux| 9089 Magnaflux Quick-Break Tester / Shot Timer Print Magnaflux| 9089 Magnaflux Quick-Break Tester / Shot Timer The QB-2+ provides a quantitative verification of quick break function and measures the duration of the magnetizing shot. For AC, HWDC and FWDC equipment. 628989: QB-2+ quick-break tester/shot timer, reference table for voltages versus coil diameter, 9V battery, carrying case and certificate. Request for information