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DH200-4 is a high-temperature dry thermostat controlled by a microcomputer. It uses high-purity aluminum material as a heat-conducting medium to replace traditional water bath devices. It has the characteristics of convenient use, large temperature control range, and high precision. It can be widely used for sample preservation and reaction, pre-denaturation of DNA amplification and electrophoresis, and serum coagulation. It adopts a two-stage redundant hardware circuit design, combined with a unique intelligent software algorithm, to achieve high temperature control accuracy, stable and reliable operation.