Feature: 1. Versatile 3 in 1 Functionality: Combines a light power meter, visual fault locator (VFL), and LED flashlight. Powered by a 3.7V rechargeable li battery with TYPE C charging capability. 2. Wide Measurement Range: Covers 10 standard wavelengths including 850, 980, 1270, 1300, 1310, 1490, 1550, 1577, 1625, 1650nm. Testing range from -50 to +26dbm for comprehensive performance evaluation. 3. Convenient Backlit Display: Features a backlit display for easy visibility in dim environments. Automatically shuts off after 10 minutes of inactivity for power saving functionality. 4. Extensive Data Storage: Fiber optic tester is capable of storing up to 500 sets of data for convenient record keeping and comparison between test results. 5. Accurate Power Testing: Boasts a low testing error of less than 0.2dB for accurate power measurements. Users can independently calibrate data for personalized accuracy. Specification: Item Type: Optical Power Meter Material: ABS Power Testing Range: -50 to +26dbm Probe Type: for 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 Power Off Time: 10 minutes Red Light Source Testing Distance: 15mW Output Wavelength: 650nm Size: Approx. 180x89x42mm / 7.09x3.50x1.65in Power Supply: 3.7V Rechargeable Li Battery x 1 Capacity 650mah (with built in battery) . Package List: 1 x Optical Power Meter 1 x FC Adapter 1 x USB C Charging Cable 1 x User Manual