The Byte Brothers RWC1000KCS is a network and cable tester that spots slow cables, bad connectors, incorrect wiring, and other communication issues from hubs, switches, and PCs. In addition to the normal distance, opens, shorts, distance to fault and wire map - the Real World Certifier (RWC) performs sophisticated timing, crosstalk and cable construction tests to display cable category (Cat 5E, CAT6, etc.), propagation delay and skew. This greatly improves your installation skills because the RWC spots slightly undercrimped connections, cable coiled in the wall and other maladies that affect cable performance. Plus, you can store up to 250 test results in the RWC's flash memory for later printing using standard Excel spreadsheets. These can be emailed or given to your customer as proof of test. And, if you wish to test hubs, switches and NIC cards, the RWC displays the device's signal level(s) and device type (10,100,1000MB/s, half and full duplex). This is useful in determining signal strength at the end of a long cable run. Includes the main unit, a toner probe, carrying case and 1 hour instructional DVD. Compatible with all network devices.