Final answer:
It is true that technicians should have both USCS and metric wrench sets, as this ensures they can work with a range of equipment in different measurement systems.
Step-by-step explanation:
True, it is recommended for technicians to have a set of both USCS (United States Customary System) and metric wrenches. These two systems are used in different contexts, with the USCS being predominant in the United States and the metric system being used by most of the rest of the world. Having both sets makes a technician versatile and capable of working on a wide range of equipment. In situations where either socket wrenches or a power drill is needed, having access to both measurement systems can be invaluable.