6 Channels Electronic Stethoscope
This instrument is ideal test tool for mechanics, electricians and vehicle repairment. 
It can be used to effectively locate the trouble spots within the engine block or locate the source of engine noise and dashboard rattle. 
You can use it to identify faults in transmission, worn gears, fuel injectors, fuel pumps, intake manifold, exhaust manifold, valves, and etc. 
It is an indispensable tool for vehicle servicemen as it allows the vehicle to be road-tested and diagnosed simultaneously.
This instrument consists of 6 clips which are equipped with a sensor apiece, a 6-channel control box, and headphones.
Battery:9V battery, 6F22 or equivalent, 1 piece