On-line monitoring device also known as visual camera or mold protection device. It consists of visual camera, magnetic stand with support arm, lighting, computer and monitor. The camera is normally installed on the side of mold platen of an injection molding machine so that it is able to monitor the mold cavities. Should there is an insufficient moldings or an incomplete knock-out, this device will send a NG signal to the machine so that mold won’t close again. In contrast, it will send a OK signal to the machine to repeat its cycle.