Stethoscopes; Body fat monitors; Hand and finger exercisers for therapeutic purposes; Massage apparatus for eyes; Medical apparatus for detecting rapid eye movement and other physiological conditions in a sleeping person indicative of dreaming and for inducing partial awakening so as to cause a state of lucid dreaming; Medical apparatus for diagnosing or treating respiratory conditions; Medical device, namely, a device for measuring arterial blood flow in the eye; Portable medical devices used for breathing exercises, namely, portable devices used for endogenous breathing exercises and for respiratory muscle training; Respiratory monitors for sports activities; Spirometers