The SawStop senses an electrical current in the hot dog. Courtesy of SawStop hide caption

itoggle caption Courtesy of SawStop

The SawStop saw can sense a slight electrical current that human fingers (and hot dogs) create. When it senses the current, the saw triggers a safety brake, which stops the blade in less than 5/1,000th of a second. Courtesy of SawStop hide caption

itoggle caption Courtesy of SawStop