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Wittner 921440 A-440 Tuning ForkSolid opaque cover lets you see the pendulum underneath! . Adjustable weight on pendulum . Manufactured in Germany.Features of Wittner 921440 A-440 Tuning Fork Solid opaque cover lets you see the pendulum underneath! Adjustable weight on pendulum Manufactured in Germany 921440Specification of Wittner 921440 A-440 Tun..