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3M Littmann Classic III Adult StethoscopeTunable technology is a 3M invention that lets you shift between hearing high and low frequency sounds by simply adjusting how much you press on the chestpiece.Soft-sealing eartips excellent acoustic seal; they snap tightly onto the eartubes for safety.Open bell stays clear of dirt and debris by keeping it covered with the small diaphragm.Adjustable headset lets you easily set the tension for head size and comfort just by squeezing or pulling apart the eartubes.No natural rubber latex or phthalate plasticizers are used in the tubing or any other component—to help protect human health and the environment.Made in the USA. We apply rigorous process and quality controls to every Littmann brand stethoscope. You’ll always get a durable, dependable, clinical tool that will serve you for years to come.