Feature:1. HD FULL TOUCH SCREEN: The 3.5 inch HD full touch screen not only delivers clear visuals but also supports multi touch for userfriendly interactions. The working wavelength of 1550nm allows for an illuminant test.2. SMALL TESTING BLIND ZONE: With a small testing blind zone, this tester offers a maximum testing range of 80km, making it highly efficient.3. INTELLIGENT LINK ANALYSIS: The optical time domain reflectometer provides intelligent link analysis and intuitively presents the analysis event, allowing for easy understanding and decision making4. PORTABLE AND USER FRIENDLY: Compact and lightweight, this OTDR tester is easy to carry around, making it ideal for field work. The smoothly multi touch control and colorful soft light screen, with adjustable brightness, offer a comfortable user experience.5. COMPREHENSIVE TESTING ABILITY: This device is especially useful for evaluating FTTx and access network construction and maintenance. It can identify optical fiber breakpoints, measure optical cable length, and calculate relative optical power loss, making it a must have tool for network testing.Specification:Item Type: Optical Time Domain ReflectometerMode: NK2800Material: ABS Power Supply: Built in polymer lithium battery capacity 2200mah (shipped with built in battery)Optical Time Domain ReflectometerG.652 Single Mode Fiber Wavelength: 1550nm20nmMaximum Allowable Power for Optical Test: 1490nm less than 10dBm1577nm is less than 10dBm1310nm is less than 10dBm1270nm is less than 10dBmMaximum Dynamic Range: 20dBMinimum Event Blind Area: Approx. 2.5m / 8.2ftAttenuation Blind Area: Approx. 10m / 32.81ftTest Range: Approx. 100m / 328.1ft, 300m / 984.3ft, 500m / 1640.4ft, 1250m / 4101ft, 2500m / 8202.1ft, 5000m / 16404.2ft, 10000m / 32808.4ft, 20000m / 65616.8ft, 40000m / 131233.6ft, 80000m / 262467.2ftTest Pulse Width: 5ns, 10ns, 20ns, 30ns, 50ns, 80ns, 100ns, 200ns, 300ns, 500ns, 800ns, 1s, 2s, 3s, 5s, 8s, 10s, 20sRange Accuracy: (1m+ sampling interval +0.005% test distance)Refractive Index: 1.00000 to 2.00000Reflection Accuracy: 3dBLoss Measurement Mode: 4 point method, 5 point methodOptical C: SC PCOptical Power MeterWavelength Range: 800nm to 1700nmWavelength Calibration: 850, 980, 1300, 1310, 1490, 1550, 1625, 1650 nmMeasuring Range: 50 to +26dBm(standard)Recognition Frequency: CW, 270Hz, 330Hz, 1kHz, 2kHzResolution: 0.01dBUncertainty: 5%Optical Connector Universal Connector: FC SC STStabilized Light SourceThe output wavelength is consistent with the OTDR output wavelengthLaser Type: FP LDOutput Power: -5dBmStability: CW,0.5dB/15min (test after 15min preheating)Optical Connector: SC PCVisual Fault LocationOperating Wavelength: 650nm20nmOutput Power: 10mWWorking Mode: CW, 1Hz, 2HzOptical Connector: Universal connector.Package List:1 x Optical Time Domain Reflectometer1 x USB Cable1 x Power Adapter1 x Carrying Case5 x Cleaning Pads1 x CD