Final answer:
Metric sockets are differentiated from imperial sockets by the measurement units marked on them. Metric sockets have measurement units in millimeters, while imperial sockets have units in inches.
Step-by-step explanation:
One way to differentiate between a metric and imperial socket is by looking at the measurement units marked on the socket. Metric sockets usually have measurement units in millimeters, while imperial sockets have units in inches. For example, a metric socket may be marked with a size of 10 mm, whereas an imperial socket may be marked with a size of 3/8 inch.