This question cannot be answered but back in the 1800s economists such as Jeremy Bentham thought that eventually they would be able to measure pleasure by measuring brain waves. In the expectation of this discovery they even developed a measure of pleasure which they called a util. They predicted that someday a machine that could measure utils would be developed. Not surprisingly they called this machine a Utilometer. The Utilometer was to be connected to people’s heads and an economist would read it as people went through their daily activities.
Although utility cannot be measured, this term is sometimes used for a unit of utility.