... the Fiber Optic Patch Cord , etc.Digital Multimeter, performs AD/DC Voltage, AC/DC Current, Resistor, Conductivity, Capacitor ... TestSignal modeNTSC/PAL (Auto Adjust)Display3.5 inch TFT-LCD ,960 x 240 resolutionLCD adjustAdjustable brightness, contrast, color ... controllerCommunicationRS232, RS422 simplex and RS485PTZ ProtocolCompatible with more than 20 protocols such as PELCO-D/P, Samsung, Panasonic, ...