Feature: 1. Self calibration by user himself. 2. Large rechargeable lithium battery supports continuous work for up long hours. 3. LCD color screen, ultra-low energy consumption, clear display does not hurt the eyes. 4. One-key to opena, press the side-key to push up, and the cover will be opened in one second after turning on the machine. 5. USB charging: universal interface, plug and use. Specification: Mini optical power meter has compact structure and stable performances. It ensures high measuring accurancy of 850nm, 980nm, 1300nm, 1310nm, 1490nm, 1550nm and 1625nm wavelengths. Combined usage with Optical-Laser-Source, it could accurately measure the loss of fifiber, cable and other passive optical devices. Features: Self calibration by user himself. Large rechargeable lithium battery supports continuous work for up long hours. LCD color screen, ultra-low energy consumption, clear display does not hurt the eyes. One-key to opena, press the side-key to push up, and the cover will be opened in one second after turning on the machine. USB charging: universal interface, plug and use. Specifications: Color: black+silver Material: plastics Test range: -50+26 Wavelength: 850, 980,1300, 1310,1490, 1550, 1625 Interface type :2.5mm universal Detection area: 300um Charging voltage: 5v Display resolution: 0.1% Logarithmic display 0.01dbm Battery: 3.7V, 600mAh Item size: 127 * 45 * 20mm / 5.0 * 1.8 * 0.8in Item weight: 87g / 3.1ounce Package size: 150 * 62 * 40mm / 5.9 * 2.4 * 1.6in Package weight: 120g / 4.2ounce Packing List: 1 * Optical Power Meter Package List: 1 * Optical Power Meter