The Hobbes NETmapper - Multifunction Network Cable Tester and LAN Verifier is a unique and versatile tool for professional network administrators to quickly check network connectivity and obtain essential information from the entire network for troubleshooting. It embodies both an active network tester and a passive cable checker. It can also check the polarity and voltage of telephone lines. The NETmapper - Multifunction Network Cable Tester and LAN Verifier features an analog tone generator and a port finder function for identifying and tracing network cables and connections.