... Voltage, AC/DC Current, Resistor, Conductivity, Capacitor and Diode test.DC12V power outputAudio inputAdjustable brightness, contrast, ... input1 channel Audio inputPTZ controllerCommunicationRS232, RS422 simplex and RS485PTZ ProtocolCompatible with more than 20 protocols such as PELCO ... -in buzzer will sound, if resistance is lower than 50ΩDiode2.0V Range, 1mV resolutionCapacitor6600pF~66 ...