... Multimeter Security CCTV Tester CE Certified Multi-Meter and Optic Power Meter, PTZ Control Security CCTV Tester Feature ... TestAudio input1CH Audio inputPTZ controllerCommunicationRS232, RS422 simplex and RS485PTZ ProtocolCompatible with more than 20 protocols ... 4800,9600,19200bpsDigital MultimeterMulti-MeterVoltage, current, resistance and capacitance measuring, continuity testing, diode testing.Laser ...