Optical Time Domain Reflectometer — T-OT600 SV20A Memory capacity >800 traces Built-in friendly-environment lithium battery with high capacity for over 8 hours of operating life Display: 640×480, 6. 5 inch low-reflection TFT-LCD (touch screen) One year WarrantyThe OTDR600 is an optical time domain reflectometry (OTDR) system for the measurement of attenuation and length of optical fibers. The OTDR600 is specifically designed for use in factories and laboratories where high linearity and productivity on factory spool lengths are crucial. OTDR testing analyzes fiber optic cable performance from end to end by testing components along the cable, including connection points, bends, and splices.