General Technologies Corp GTC GTC505 Engine Ignition Analyzer Measures spark peak voltage, for finding primary and secondary coil faults Displays ignition waveforms in real time, allowing for detailed analysis Detects ramp time (or dwell angle), for diagnosis of timing issues and primary coil faults Has chart and comparison functions, allowing the user to find intermittent issues Works on all spark-ignition engines, from small 2-stroke engines with magnetos to modern cars with computer-controlled coil on plug systems