Feature: 1. FUNCTIONAL USES: Our OTDR is valuable for assessing FTTx and access network construction and maintenance. It is effective in identifying optical fiber breakpoints, measuring the length of optical cables, and calculating relative optical power loss. 2. MULTI PURPOSE DISPLAY: The device features a 3.5 inch color touchscreen which includes useful functions like OTDR, event reflection, optical power meter, visual fault locator, stable light source, ethernet cable length measurement, ethernet cable finder, RJ45 ethernet cable sequence, and LED light. 3. ADVANCED WAVELENGTH ISOLATION TECHNOLOGY: We utilize advanced wavelength isolation technology that allows for in light testing. It ensures the testing process does not cause damage to optical devices, strictly protecting the accuracy components against complex measurement environments. 4. ROBUST AND RELIABLE: Our OTDR stands up to complex and challenging use environments. Its robust design is crafted to offer excellent performance durability for continuous, long term use. 5. HIGH ACCURACY: OTDR tester offers ultra accurate testing results, providing you with accurate and reliable data to assist in maintaining high standards for fiber optic networks. Specification: Item Type: Optical Time Domain Reflectometer Material: ABS Dynamic Range: 20dB Test Range: Approx. 100 to 80000m / 328.1 to 262467.2ft Wavelength: 1550(±20nm) Optical Interface: SC Battery: Rechargeable lithium battery 4800mah x 1 [Shipped with built in battery] Pulse Width: 5ns to 20μs Measurement Time: 5s to 180s Measurement Mode: Real time, average, automatic Attenuation Blind Area: Approx. 10m / 32.8ft Event Blind Area: < Approx. 3 meters / 9.8ft Sampling Point: 8000 Input Optical Detection: Supported Maximum Allowable Power for Light Test: 1270nm