California Code
CHAPTER 5 - Cleaning and Sanitizing of Equipment and Utensils
Section 114099.5.

114099.5. In manual warewashing operations, a temperature measuring device shall be provided and readily accessible for frequently measuring the washing and sanitizing temperatures.

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