Like its menu, the equipment the company cooks its hamburgers with has also evolved as the company expanded. 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.[2]:27[129] The Insta-Broiler worked by cooking 12 burger patties in a wire basket, allowing the patties to be cooked from both sides simultaneously.[2]:27 When McLamore and Edgerton took over the company, besides dropping the "Insta-" prefix, they switched to an improved unit, which they called a "Flame Broiler". Designed by the two and featuring stationary burners that cooked the meat on a moving chain, the unit broke down less often, while maintaining a similar cooking rate.[129] The company would stay with that format for the next 40 years until Burger King began developing a variable speed broiler that could handle multiple items with different cooking rates and times.[152][153][154] 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, accompanied with a computer-based product monitoring system for its cooked products.[155] The monitoring system allows for more concise tracking of product quality, while giving the company and its franchisees a method to streamline costs by more precisely projecting sales and product usage.