12
General Purpose Water Baths
to run dry. However, a tank going dry during operation can strain interior surfaces so this should not be
allowed to occur. During operation a minimum of 5cm (two inches) of distilled water should be in the tank.
Check water bath water level frequently, add water as needed. Please note that at higher operating
temperatures, or in applications where a cover is not used, more frequent water level checking is required.
Test-tube Racks
If the water bath tank boils dry while containing plastic-ware, the plastic will melt. If you intend to use test-
tube racks that are wire or plastic-coated wire that may wear and expose metal, damage may occur to the
tank. It is recommended that all-plastic racks be used, and that the tank never be allowed to boil dry.
