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Pair of Steel Tuning Forks (440Hz) in Wood Bases, One Adjustable(2) Tuning forks with bases, (1) MalletFor demonstrating the production of beat frequencies. Comprises two nickel plated forks A (440 Hz +-5%) mounted on individual boxes. One fork is provided with adjustable mass by means of which frequency may be shifted from the nominal 440 Hz .When both forks are sounded a clearly audible 'beat' is produced, its rate depending upon the difference in frequency between the forks.