A weight measure device includes a casing having a first side connected to a suitcase. A combination lock is received in the casing and an actuator extends into the casing for driving the combination lock. A connector is movably mounted to a second side of the casing for sensing the weight of the suitcase and transmits a signal to an electronic unit that is disposed in the casing. The electronic unit converts the signal from the connector into a weight unit and shown thereon.