A professional diagnostic tool necessary for engine repair. It is used to detect abnormal engine sounds and issues with other vital components. Diagnostics are performed via audio control. Made of stainless steel. The kit includes a metal probe rod that transmits sound. Engine noises are delivered to the ears through a flexible tube. It can be used not only for engines but also for gearboxes, transmissions, bearing systems, and anywhere else necessary, including AC systems. Diagnosis can be performed without disassembling the unit.