A torque-indicating wrench comprises a wrench body including a head to engage and turn a workpiece, and a stem having two outer longitudinal wall segments. The copy apparatus includes a scan unit to scan an image, a pattern detection unit to detect patterns corresponding to pre-stored copy prevention patterns from among patterns in the scanned image, and a control unit to prevent the image from being printed if a ratio of the detected patterns is identical to a ratio of the copy prevention patterns. A wick structure is disposed on the inner surface of the body, and the inner ring is disposed in the enclosed space for increasing a structural strength of the heat pipe.