Features: 1.WITH VISUAL FAULT LOCATOR: Optical power meter with OPM and VFL function, more convenient and powerful, with visual fault locator. 2.HIGH ACCURACY: Handlend optic fiber cable tester tool has an accuracy of 0.2dB, which is very professional and ensures stable and accurate measurement results. 3.2.5MM UNIVERSAL INTERFACE: Mini fiber light attenuation tester with 2.5mm universal interface, 7 optional wavelengths, respectively, 850/980/1300/1310/1490/1550/1625nm. the measurement range is (?70) to (+6) dBm. 4.BACKLIGHT LCD SCREEN: The screen comes with a backlight display, providing a clear viewing display, ideal for viewing in dark and low light environments, and is equipped with a LED light. 5.AUTO SHUTOFF: The exterior features a silicone protective case that is shockproof and drop proof to minimize collision damage and prolong service life from drops and other damages, and the auto shut off function ensures longer working time and standby time. specification:Item Type: Fiber Optical Power Meter Material: ABS Wavelength: 850 to 1625nm (850/980/1300/1310/1490/1550/1625nm) Measuring Range: (-70) to (+6) dBm Optical Connector: 2.5mm Universal Connector Power Supply: 2xAAA Batteries (Not Included) Resolution: 0.01dB Accuracy: 0.2dB Operating Temperature: -10 to +60 (C) Storage Temperature: -25 to +70 () Product Volume: Approx. 137 x 60 x 37mm / 5.4 x 2.36 x 1.5in Battery Operating Time: 20 h PackageList:1x FiberOpticalPowerMeter (BatteryNotIncluded) 1 xInstruction Manual Download Guide