5inch 5MP 4-in-1 TVI AHD CVI CVBS CCTV Security Camera Tester CCTV Tester HG. The new HD coaxial tester is developed for the on-site installation and maintenance of HD coaxial camera, having TVI, AHD, CVI. It also provides many useful functions, such as video display, PTZ control, DC12V output power, audio test, image generator, VGA ...