Blueskysea HVT-2611 3.5" Full-View Camera CCTV IP Tester PTZ PING Optical Power Meter 12V PING testingtest IP camera or other network devices ethernet port whether work normally, and the IP address whether right IP address scan, quickly search the IP address for the connected IP camera and other network devices POE voltage measurementtest the PoE switchs voltage to IP cameras, wireless AP device and other PD devices Device Port flickereasy to find the connected PoE switch port by sending special signals, the connected PoE port will flicker at special frequency. Network cable and Telephone cable testing, display the sequence of connection and the NO of the LAN cable