OptiSafe Digital Super Tinter is a single quart tank heating system combining accurate digital temperature control, variable stirring action, split lid, and nonstick tank (Vat) for heating lens tinting solutions. The detachable temperature probe (Fig.1) is immersed into the tint solution to reflect solution temperature, not the temperature of the HTF as in conventional heating systems. The unit requires only 15 fl. oz. (443 ml) of HTF. The HTF is a water soluble, environmentally safe, nonhazardous, biodegradable oil blend. Multiple units can be aligned side by side to create a tinting system that is perfect for your needs.