Mechanic's 6-channel electronic stethoscope

Tool designed for parts condition detection without part removal necessity. All working parts produces different frequency waves which provides many informations about its condition. Input signal is processed by piezoelectric converter which amplifies signal and seperates it from outer noises. Signal from converter is transmitted to high quality comfortable headphones. Six pick-up sensors with long cords are connected to sensor selector unit which provides listening from six different places. For convenience each cord has different colour. In simple cases probe could be connected directly to headphones.