1Wavelength memory function can remember the test wavelength set before shutdown after shutdown. 2After switching the wavelength, the wavelength before and after the startup is unchanged. 3Meanwhile, accurately identify the optical fiber transmission frequency, which can be used to determine the light emitting mode during the project construction process, whether it is continuous / intermittent. 4Protected by the plastic shell, reduce the damage to the machine caused by collision and accidental fall to a certain extent. 5Fiber testing tool keeps simple and convenient operation with stable and reliable performance. Item Type: Optical power meter Material: Engineering plasticWavelength Range: 800-1700nm Input Voltage: DC3-6V Connector: FC/SC/ST Detector Type: InGaAs Measuring Range: -70 to +3 db Uncertainty: 5% Standard Wavelength (nm): 850nm, 1300nm, 1310nm, 1490, 1550, 1625nm Display Resolution Linear Display: 0.1% logarithmic display: 0.01dBm Working Temperature (): -10 to +60 Storage Temperature (): -25 to +70 Automatic Shutdown Time: (Min) 10 Battery Model: SGA3-00042 Battery Type: Lithium battery Battery Capacity: 600mAh 1 x Optical Power Meter1 x USB Cable