3.5in Optical Time Domain Reflectometer High Accuracy Multifunctional Visual Fault Locator OTDR with LED Light 80km 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 <10dBm 1310nm <10dBm 1490nm <10dBm 1577nm <10dBm OPM Power Range: -50 to 26dBm OPM Response Wavelength:700nm to 1700nm OPM: Calibrated wavelength of 850 nm, 1300 nm, 1310 nm, 1490 nm, 1550 nm, 1625 nm OPM Power Uncertainty: ±0.2dB Red Light Source Power: 10mW Display: 3.5 inch multi touch color screen Data Cable Type: Type C Manual Calibration Function: Supported LED Flashlight Function: Supported Scalable External Storage: USB flash drive (temporary storage) Operating Temperature: 0℃ to 50℃ Storage Temperature: -20℃ to 70℃ Relative Humidity: <90%