ST. LOUIS -- J.L. Sims Co. has introduced a thermometer to measure the internal temperature of a hamburger. o the hamburger, it must remain five seconds. If the tip of the stick turns black, the meat has reached a temperature of 160 degrees F, the minimum necessary to kill illness-causing E. coli 0157 H:7 bacteria. The sticks come 12 to a pack, with a suggested retail price of $1.99 .

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