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C- 128 FREQUENCY TUNING FORK W WEIGHTS Made of aluminum alloy and designed to meet medical requirements, the different frequencies of the tuning forks test hearing capabilities as well as testing for bone fractures. 128 hz frequency. Weights can be adjusted with an allen wrench to change frequencies. Quality Product.  Will not rust or tarnish.  A Prestige Medical Brand Product.  A leader in the Medical Industry for over 30 years.