1、4 in 1 Design: Can be used as OTDR, optical power meter, red light source and visual fault locator, very practical and reliable for work. 2、Easy Analysis: The data can be uploaded through the USB interface to analysis the testing condition, testing curves, average loss and more. 3、Smart Testing: Can be widely used to evaluate FTTx and access network construction and maintenance, identify fiber optic break points, etc. 4、Clear Display: Equipped with large LCD screen, the optical time domain reflectometer enables clear digital display for simpler operation. 5、Easy Carrying: Comes with a compact size and a light weight as well, the OTDR is very convenient to carry for both indoor and outdoor use. Item Type: Optical Time Domain Reflectometer Model: 1550-D Standard Optical Power Meter: Digital Wavelength Range: 800-1600nm Probe Type: InGaAs Power Measurement Range: -70dbm ~ +6dbm Measurement Accuracy: 5% Display Resolution: 0.1dBm Fiber Category: Single Mode Fiber Optic Interface: SC Red Light Source: Working Wavelength: 650nm Light Emitting Device: FP-LD Output Power: 10mW Modulation: OHZ, 1HZ, 2HZ Fiber Category: Single Mode Fiber Optic Interface: SC Stable Light Source: Working Wavelength: 1550nm or 1610nm Light Emitting Device: FP-LD Output Power: -10dBm Modulation: 270HZ, 1K 2K Fiber Category: Single Mode Light Loss Test: Fiber Optic Interface: SC Test Range: 0-30dB Measurement Accuracy: 10% OTDR: Laser Tube: 1550nm or 1610nm Detection Diode: APD Measurement Resolution: 0.6 Meters Event Blind Spot: 3 Meters Attenuation Blind Spot: 10 Meters Test Pulse Width: 10, 30, 100, 300ns, 1, 3. 6us. Scattering Depth: 20db, 6us. Test Length for Event: 60km Test Length for Attenuation: 30km Power Supply Method: 1 x lithium battery, 4000mAh, shipped with built in battery. Power Adapter: Micro USB5V 1000mA. Maximum Single Current: ≤ 200mA Standby Current: ≤ 10uA Battery Continuous Working Time: ≥ 10H Automatic Shutdown Time: Adjustable Working Temperature): -10℃ ~ +50℃ Storage Temperature: -25℃ ~ +70℃ 1 x Optical Time Domain Reflectometer 1 x Aluminum Alloy Tool Box 1 x Charger 1 x USB Charging Cable 1 x Cotton Swab Kit 1 x FC Flange Connector 1 x User Manual