The heating system model 4VS is a Four quart or Eight mini tank (or combination of both) Dual Temperature Control Dye Heating System. The standard unit consists of FOUR stainless steel quart-sized tanks (vats) in stainless steel housing for durability, minimum heat radiation, and maximum thermal insulation. Model 4VS is designed for optimal performance in heating optical lens coloring solutions and other similar applications, with a temperature range from 60o F to 250o F (16o C - 121o C). The standard four quart unit can hold up to 8mini-sized vats (optional), allowing flexibility of constructing a heating system that is suitable for your lab.