Like its menu, the equipment the company cooks its hamburgers with has also evolved as the company grew. The burgers have always been broiled mechanically; the original unit, called an Insta-Broiler, was one of two pieces of equipment the founders of Insta-Burger King purchased before opening their new restaurant. The Insta-Broiler worked by cooking 12 burger patties in a wire basket, allowing the patties to be cooked from both sides simultaneously. With the acquisition of the chain by its Miami franchisees came an improved unit dubbed a "Flame Broiler". Designed by the new owners, it featured stationary burners that cooked the meat on a moving chain. The unit broke down less often, while maintaining a similar cooking rate. The cooking format remained for the next 40 years until Burger King developed a new, variable speed broiler that could handle multiple items with different cooking rates and times. These new units began testing in 1999 and eventually evolved into the two models the company deployed system-wide in 2008–2009. Accompanying these new broilers was new food-holding equipment and a computer-based product monitoring system for its cooked products. The new system allows for more concise tracking of product quality, while giving its users a method to streamline costs by more precisely projecting sales and product usage.