This device measures 8 standard wavelengths: 850/980/1300/1310/1490/1550/1625nm, with a testing range of -50dBm~+20dBm, and includes a 10mW red light source. It features support for illumination, automatic shutdown, backlight selection, wavelength memory function, and user calibration. It supports //ST 2.5mm universal interface, RJ45 testing, and simultaneous display of linear mW and non-linear index dBm. This light meter & VFL is accurate in testing, exquisitely crafted, and easy to carry, completely replacing the need for separate light meter and red pen tools. Specifications: Material: Plastic Size: 118 x 65cm Color: Yellow Calibration Wavelength: 800~1700nm Optical Connector: //ST Universal Interface Detector Type: InGaAs Measurement Range: -50 ~ +20dBm Accuracy: 0.2dB Standard Wavelength: 850, 980, 1300, 1310, 1490, 1550, 1625nm Display Resolution: mW: 0.1%, dBm: 0.01dBm VFL: 1mW 650nm Light Source Operating Temperature: -10~+60℃ Storage Temperature: -25~+70℃ Automatic Shutdown Time: 10 minutes. Over Red Light: 5mW: 2 x 7 batteries (batteries not included) Continuous Battery Life: Over 48 hours Package Includes: 1 x Fiber Meter 1 x Charging Cable Only the above package content, other products are not included. Note: 1. Please allow for slight errors due to manual measurement. Make sure you don't mind before bidding. 2. Due to different monitors, colors may vary, please understand.