A new generation of CCTV tester, has a 3.5-inch LCD 480 * RGB * 320 (HVGA) resolution and 64K color LCD screen. Directly support high number of lines of video camera input image, can detects the input video image effects. And you can display the contents of the video in the digital zoom (fit screen, 1X, 2X, 4X four kinds of magnification). It is common that cameras having defects like corner focus blur, or having dust on lens. And when installing a camera, user needs to adjust some finest detail. To discover the camera defects and do the adjust, there are some difficulty if using a small size screen. With the digital zoom function, user can do the job easily and efficiently.