Business and Professions Code section 13489
(a)
The device mechanism accurately measures the quantities of the gasoline being simultaneously withdrawn from each of the two tanks and the quantity dispensed.(b)
The device mechanism accurately and visibly records and displays the resulting combined quality, the total quantity, the price per gallon or liter for the particular quality combination being dispensed, and the total price of the quantity of gasoline dispensed at the particular sale.(c)
The device has a locking selector mechanism which prevents the changing of the proportion of the two qualities being combined during the dispensing of the desired quantity.
Source:
Section 13489, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=BPC§ionNum=13489.
(accessed Jun. 2, 2025).