A serological water bath is a laboratory device used to incubate and control the temperature of samples in serological assays, such as blood typing and serological tests for infectious diseases. It consists of a stainless steel chamber filled with water that is heated and maintained at a specific temperature by an electrical heating element and a thermostat.

Serological water baths are typically designed to accommodate small vials, test tubes, or microplates, and they may be equipped with a shaking mechanism to ensure uniform mixing of samples. They are commonly used in clinical and research laboratories, where they provide a controlled and consistent environment for conducting serological tests.