DayMark Thermostrip Dishwasher Sanitization Temp Labels, 160 Degree F (Pack of 24) Waterproof irreversible label provides proof that sanitizing temperature has been reached Label changes from white to black when temperature has been attained Adhesive backed; Label Size 1/2" x 1 3/4" Withstands extreme conditions of Commercial dishwasher Red color provides a highly visible and easy-to-find thermal indicator