From the Manufacturer Byte Brothers tools exhibit 3 qualities: Innovation- It moves our company and our customers forward. Top quality- work requires tools that repeatedly perform. Affordable- Tools are useless unless you can afford to buy them. Byte Brothers guarantees these 3 qualities plus offers US based customer support, training and quick upgrade and warranty service. Whether you are in the dotcom, telecom, audio/video. electrical or security field, you will find Byte Brothers products designed for you at a price you can afford. Product Description Real World Certifier. Model RWC1000K. Can"t afford a 5000 certifier but want a more professional test than your are performing now? 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 under-crimped 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. What to locate a jack? Use the toner or blink the LED light with our "port blinker." Includes a Main unit; Probe with built-in Remote jack; zippered and embroidered case; patch cables; USB cable; two 9V batteries; instruction manual; "Passed" stickers; 1 hour DVD; and software CD.