MASTER MST-101 Automotive Electronic Faults Detector The MST-101 detector is using advanced technology from Germany, it can collect and analyze signals under non-dismantle automotive electrical parts, Testing results are showed by LED indicator and beeper. Easy to know if there is faults of the automotive electronic parts Test Range: Ignition Coil(traditional coil,double spark coil,single spark coil) generator, fan,electric-magnetic valves,emission gas controlling value, fuel injectors,relay.etc.