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The Walker Cat. No. 47-613 Hydrometer 20/1200 is a precision medical and lab equipment device manufactured by the brand Walker in the United States. This hydrometer is designed to accurately measure the specific gravity of fluids within a specified range of 20 to 1200. It is a reliable tool used in various healthcare and industrial settings for testing and scientific applications. Its high quality and accuracy make it a valuable asset for professionals in the field of medicine and research.

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