CCTV Tester is a professional tools in the process of CCTV system installation ,It is developed for the On-Site installation and maintenance of video monitoring system. It can be used for displaying video, testing video level, controlling PTZ, scanning PTZ address,  generating images, capturing data of RS485 and testing LAN cable etc. Its functions, easy operation, and portability makes it simple for the CCTV technician to install and maintain CCTV system, improving work efficiency and get the labor cost down ,in your installation and testing process, provide a convenient, saving installation time and costs. There are 5 from advanced machines to choose,ST-890/891/893/894/895 , welcomed the Advisory .