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The power cable it's cut off. Unit for parts The Grass Instruments Polygraph DC Driver Amplifier P511 is a specialized pre-amplifier designed for use in medical and lab equipment. This product, part of the Grass Instruments brand, is known for its quality and reliability in providing accurate and clear signals for various testing and monitoring purposes. With its AC capabilities, this amplifier is essential for conducting precise tests and experiments in research settings and healthcare applications.

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