California Code
CHAPTER 5 - Cleaning and Sanitizing of Equipment and Utensils
Section 114101.2.

114101.2. A warewashing machine shall be equipped with a temperature measuring device that indicates the temperature of the water as the water enters the hot water sanitizing final rinse manifold or in the chemical sanitizing solution tank.

(Added by Stats. 2006, Ch. 23, Sec. 2. Effective January 1, 2007. Operative July 1, 2007, by Sec. 3 of Ch. 23.)