When used with a dual-trace lab scope, the SenX FirstLook Automotive Engine Diagnostic Sensor Model ADS ES 100 performs like an engine analyzer, providing performance data on engine cylinders, valves and injectors without any disassembly. When an engine turns over, it generates an exhaust pulse every time a valve opens. FirstLook connects to the tailpipe to analyze these pulses and capture data relative to how the engine and, more specifically, each cylinder is performing. Comparisons can then be made between the different engine compartments to help determine if and where a problem exists.