Adscope? Lite 619 Ultra-lite Clinician Stethoscope *      Combination diaphragm/bell adult chestpiece precisely machined from aluminum alloy Ultra-lightweight  only 3.7 oz (105 g) Extra-large 1 3/8  diameter bell and highly sensitive 1 3/4  diaphragm ADC?s AFD technology further enhances acoustic response; use light pressure for low frequencies  firm pressure for high frequencies Clinician headset boasts reinforcing yoke molded into the flexible 22  PVC tubing 15% thicker tubing (compared to Adscope 609)  made without natural rubber latex or phthalates Overall length 30  18 tubing colors and 4 satin metal finishes Adsoft? Plus Snap-on silicone eartips Non-chill bell and diaphragm retaining rim for patient comfort Includes both large and small Adsoft? Plus eartips and scope ID tag Individually acoustic tested and inspected in the USA Lifetime warranty and free parts forever