The Polyscience WBE20A11B 20L Digital Water Bath is designed to handle a wide range of laboratory procedures including incubation, inactivation and agglutination as well as most pharmaceutical, serological, biomedical and industrial procedures. To ensure optimum temperature uniformity, your Water Bath features an energy efficient, large-area heater and thermostatic control. Its PID microprocessor control (Proportional Integral Derivative) system provides proportional heat control by anticipating the approach to your set point temperature and preventing overshoot. A redundant safety thermostat is standard on all models.