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Here’s what makes the 3M Littmann Classic III Stethoscope stand out * Features * • Tunable technology is a 3M invention that lets you shift between hearing high and low frequency sound by simply adjusting how much you press on the chestpiece. • Soft-sealing eartips give you a comfortable fit and an 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 others component – to help protect human health and the environment. • Made in the USA for consistent quality. We apply rigorous process and quality controls to every Littmann stethoscope. You’ll always get a durable, dependable, clinical tool that will serve you for years to come. * Classic III Stethoscope Specification * • Length : 69 cm/ 27.2 inches • Weight : 150 grams • Acoustic Performance : 7 • Warranty : 5 years • Please register for your warranty at http://go.3M.com/MYLittmannWarranty * Chest Piece * • Construction : Two-sided, adults and pediatrics • Material : Stainless steel • Diaphragms Type : Tunable, single piece • Diaphragms Diameter : Adults: 4.3cm / 1.7in. Pediatric: 3.3cm / 1.3in * Tubing * • Construction : Single lumen (single acoustic channel within tube) • Material : Not made with natural rubber latex Or Phthalate plasticizers * Headset * • Material : Wide diameter aerospace alloy / anodized aluminum