CTA Tools 2015 Mechanic's Stethoscope Provides an Accurate and Fast Method for Locating and Identifying Trouble in Engines and Other Moving Parts Perfect for Locating Sounds Like the Flow of Water, Oil, Gas, Steam, Etc Includes an Extra 10-Inch (21-Centimeter) Extension Probe Heavy-Duty Construction Allows for Strength and Durability CTA Tools Offers One of the Widest Ranges of Professional Specialty Tools in the Market