Super-sensitive sonarscope with rubber cone and test probe. Suitable for detection of faults in: Engine, Transmission Cat Intake/Exhaust Manifold Fuel Injectors, Radiators Valves, Fuel TanksKit includes audio probe, headphones, four clip-on microphones and four channel microphone selector box. Used by Noise, Harshness and Vibration engineers to isolate problem sources. Enables vehicle to be road-tested and diagnosed simultaneously.Requires 2 x PP3 Cells.