The Compact STE3 Electronic Stethoscope, Frequency Range 30Hz - 15KHz is designed to help locate the source of excess bearing and machine noise easily at low cost. It is an ideal easy to use listening device for mechanical generated noise in all types of applications. The 3.5mm jack socket tape output can also be fed into an audio tape recorder to store the data for either further analysis or as a reference for future comparison. The STE3 Electronic Stethoscope is an ideal easy-to-use listening device for mechanically generated noise in all types of applications.