MIDDLE C || Tuning fork scientifically tuned to the absolute concert pitch middle C (256 Hertz) TWO-PRONGED || A two-pronged plain shank fork used for tuning musical instruments, calculating frequency in scientific experiments, understanding the principles of sound waves and in chakra healing practices RESONANCE || Used as an acoustic resonator - Resonates at the specific constant pitch after striking against a surface - Emits a pure musical tone once the high overtones fade out MULTIFUNCTIONAL || Great for use in a physics science classroom, laboratories, homeschool and in musical settings DURABLE & STURDY || Made of premium quality aluminum that is built to last Tuning fork scientifically tuned to the absolute concert pitch middle C (256 Hertz). A two-pronged plain shank fork used for tuning musical instruments, calculating frequency in scientific experiments, understanding the principles of sound waves and in chakra healing practices. Used as an acoustic resonator. Resonates at the specific constant pitch after striking against a surface. Emits a pure musical tone once the high overtones fade out. Made of premium quality aluminum that is built to last. Eisco Labs proudly manufactures its own products using state-of-the-art equipment, and following the highest standards of quality control. Each product is carefully designed by a team of laboratory professionals and experienced engineers with quality and durability in mind. They are manufactured with only the highest grade, raw materials and according to international quality standards to ensure that they can withstand use in even the toughest laboratory environments.