Feature: 1. [Three in One] This fiber optic tester combines the functions of a fiber optic power meter, visual fault locator (VFL), and LED light, featuring a backlit display for easy reading. 2. [Wide Testing Range] The fiber power meter offers a testing range of -50 to +26dbm and supports 10 standard measurement wavelengths from 850 to 1650nm. 3. [Long Distance Red Light] The built in red light source of this fiber optic meter can test distances up to 30mW, providing dependable results for various fiber optic applications. 4. [Rechargeable and Convenient] Built in 3.7V 650mAh rechargeable lithium cell, this optical fiber power meter can be easily recharged via TYPE C interface, convenient and portable. 5. [Multi Functions] Capable of storing up to 500 sets of data, featuring an automatic shutdown after 10 minutes of inactivity, and allowing users to calibrate data independently. Specification: Item Type: Fiber Optic Tester Material: ABS Model: A C510B Power Testing Range: -50 to +26 dBm Probe Type: InGaAs Wavelength Range: 850 to 1650nm Testing Accuracy: ±0.2dB Standard Wavelength (nm): 850, 980, 1270, 1300, 1310, 1490, 1550, 1577, 1625, 1650 Display Resolution: Linear Display: 0.1%, Logarithmic Display: 0.01dBm Operating Temperature (℃): -10 to +60℃ Storage Temperature (℃): -25 to +70℃ Auto Shut Off Time: 10 Minutes Red Light Source Testing Distance: 30mW Output Wavelength: 650nm Size: Approx. 180x89x42mm / 7.09x3.5x1.65in Power: 1 x 3.7V Rechargeable Lithium Cell, Capacity: 650mAh (Built in). Package List: 1 x Fiber Optic Tester 1 x FC Adapter 1 x USB C Charging Cable 1 x User Manual