The basic features Lightweight and small size design ensures easy portability and use Made precisely to provide an excellent level of service Designed elegantly to offer a higher level of efficiency and effectiveness Adjustable hinge for medical and musical tuning. 128 /256/512 Hz, best quality for sound therapy Diagnostic tool for medical offices, hospitals, nerve diseases, vibratory sensory testing, diabetic neuropathy, and examination Reverb bank naturally vibrates for public health experts, musicians, teachers, and therapists Adjust the viola C string to 128 or 256 or 512 Hz Sound therapy, physics laboratory, scientific class, sound experiments Made from stainless non-magnetic aluminum alloys that do not cause loss of shine Good ring tone