This document describes the specifications of a water bath used for incubating culture tubes in coliform analysis. The water bath has an inner size of approximately 0.4 x 0.3 x 0.15 meters, is made of stainless steel inside and stove enameled outside, and can maintain temperatures from ambient to 50°C with an accuracy of ±0.1°C. It has a double wall for insulation, a dome lid to hold test tubes vertically, and displays the internal water temperature.