Offered to the medical industry by The Doctors Research Group, all PureTone models have the ENR (External Noise Reduction) tube technology, which acts to reduce inadvertent rubbing or patient induced artifact through the stethoscope tubing that may interrupt sensitive cardiac exams. This is made possible by using a special stainless steel spring coil inside a Neoprene tubing material. The steel coil reduces sound attenuation as the pressure waves moves through the tube and the neoprene material blocks exterior ambient sounds from coupling to the tube. The soft, flexible tube will resist cracking and provide outstanding low loss sound transmission for many years.

Further included with the PureTone stethoscope is DRG's patent pending GELseal eartips for maximum comfort and complete acoustic seal.The liquid filled eartips are designed to conform to the ear for a cushioned grip and designed to form a complete acoustic seal. Made from a soft Glycerin filled rubber shell, the GELSeal ear tips will conform to an individual's unique ear canal shape to seal out exterior sounds.

Each stethoscope comes with the SafeSEAL Antimicrobial Soft Stethoscope Diaphragms by Doctors Research Group with the non-chilling attribute against the patient's skin. The DRG stethoscope diaphragms are acoustically sensitive to sound, latex-free, non-allergenic and resistant to ripping.