A double unit organ bath is a device used in scientific research to study the functions and effects of drugs on isolated organs. It consists of two separate baths, each with its own temperature and pressure control, designed to hold an organ in a stable environment. The organ is suspended in a physiological solution, which is usually a balanced salt solution, and electrodes are used to measure the electrical activity of the organ. Drugs can then be added to the solution to study their effects on the organ. This technique is useful in studying the effects of drugs on isolated organs, such as the heart, and can help researchers understand the effects of drugs on the entire body.