1、HIGH ACCURACY: The accuracy of Optical power meter is ±0.2dB, which is very professional and ensures stable and accurate measurement results. 2、2.5MM UNIVERSAL INTERFACE: Mini optical fiber power meter with 2.5mm universal interface, widely used, the interface comes with a silicone dust cover to protect the interface from damage and longer service life. 3、7 WAVELENGTHS: Handlend optic fiber cable tester tool has 7 selectable 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 that provides a clear viewing display, ideal for viewing in dark and low light environments, and is equipped with an LED light that can be illuminated in the dark. 5、SHOCKPROOF: Auto shut off function further ensures longer working time and standby time. The exterior features a silicone protective case that is shockproof and drop proof, reducing collision damage and prolonging its lifespan from drops and other damages. 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 1 x Fiber Optical Power Meter (Battery Not Included) 1 x Instruction Manual Download Guide