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 CTX200P Pocket CAT is a combination CAT5-6/Coax Tester and Toner/Probe set. Its low cost, versatility and rugged design make it the perfect tester for any toolbox. The Cable Test/Tone unit identifies opens, shorts, crosses and split pairs with instant PASS/FAIL results. It also generates a tone for tracing cables. The Lighted Probe detects the tone generated from the Main unit. Note: The CTX200P is also available without the lighted probe. See part number CTX200. Features of Main unit: The Main unit tests both RJ45-CAT5/6 and coax cables. Ruggedized for field use with a cushioned case and no LCD to break. PASS/FAIL results appear in one second and each pair"s status is highlighted. A TIA568 test is performed: continuity, opens/shorts, reversals and split pairs. Includes tone mode for tracing and troubleshooting. Other features: Auto-off (12 seconds) battery saver; low battery indicator; belt clip; battery (9V);and zippered pouch. Features of Tone Probe: The Tone Probe features high end probe technology for detecting the tone from the Main unit. Also included is an ultra bright LED lighted tip for seeing in dark closets; a safety LED to indicate "60HZ present"; a "Tone present" LED lights to aid in noisy environments; an insulated tip to stop accidental shorts when probing punch down blocks; and a volume control. Battery (9V) included.