The Model 350 ultra-low cryogenic temperature controller is a powerful physics tool. Designed for the demands of pumped He-3 refrigerators and other ultra-low and low temperature platforms, the Model 350 provides excellent measurement performance, superior control accuracy, and convenient operation in a wide range of advanced research applications.
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Manufacturer's Website: http://www.lakeshore.com/products/cryogenic-temperature-controllers/model-350/Pages/Overview.aspx