Low temperature and constant temperature water tanks are widely used in research departments such as petroleum, chemical industry, electronic instrumentation, physics, chemistry, biological engineering, medicine and health, life sciences, light industry food, physical testing and chemical analysis, colleges and universities, enterprise quality inspection and production departments, It provides users with a controlled heat and cold field source with uniform and constant temperature during work. It can conduct constant temperature tests or tests on test samples or products. It can also be used as a heat source or cold source for direct heating or cooling and auxiliary heating or cooling.