Features: 1.Multi Function: This fiber optic cable tester integrates OPM, VFL and cable testing function, testing range is minus 70dBm to plus 10dBm, provide 70dB optical power measurement, 10mW/650nm light source. 2.High Accuracy: This optical fiber power meter can measure 850nm, 980nm, 1300nm, 1310nm, 1490nm, 1550nm and 1625nm wavelengths. High measurement accuracy, measuring error is minus 5 to plus 5dbm. 3.Visual Fault Locator: This optical power meter is designed with visual fault locator for locating fiber breakage or entanglement, with continuous and flashing operating modes, to check whether the LAN cable is in good condition or disconnected. 4.Micro USB Charge: This network cable tester with 300mAh battery adopts Micro USB charging interface. Easy to read LCD can display power loss data, wavelength, frequency, battery capacity, and battery charging status. 5.250 Sets of Data Storage: This power meter supports backlit and auto off, and it can store up to 250 sets of data, which can be viewed at any time. specification:Item Type: Fiber Optic Cable Tester Material: ABS, Printed Circuit Board Battery: 300mAh Polymer Lithium Ion Battery (Inbuilt) Network RJ45 Connector Test: Standard RJ45 Connector Type: FC/SC/ST Light Efficiency Measurement Range: Minus 70 to Plus 10dbm Wavelength Range: 800 to 1700nm Red Output Standard: 10mW/650nm Measurable Optical Power: Maximum 10mW (10dbm) Wavelength: 850/980/1300/1310/1625/1490/1550/1625 Light Efficiency Resolution: 0.01nw or 0.01dbm Data Storage: Maximum 250 Sets of Data Charging Port: Micro USB PackageList:1 x Fiber Optic Cable Tester 1 x USB Cable 1 x Storage Bag 1 x User Manual