... TestAudio input1 channel Audio inputPTZ controllerCommunicationRS232, RS422 simplex and RS485PTZ ProtocolCompatible with more than 20 protocols such as PELCO-D ... 660K, 6.6M, 66MΩ auto/manual rangeContinuityBuilt-in buzzer will sound, if resistance is lower than 50ΩDiode2.0V Range ... resolutionCapacitor6600pF~66,000μF auto/manual rangeSpecification 3.5 inch CCTV Tester with PTZ controller and Multimeter