... tester Features:u 2.8" TFT-LCD screen, English menu, display signal systemu Test video signal strength; Video Generating, PAL/ ... pickup devicecctv Tester Data:VIDEO SIGNAL TESTINGVideo mode:PAL / NTSC auto adjustDisplay screen:2.8 inch LCD color display screen, ... RS323, RS422, RS485 at the same timeCommunication protocol:Compatible with various protocols: Pelco_D, Pelco_P, Samsung, Panasonic, Minking, ...