Feature: 1. Wavelength set before shutdown can be remembered by optical power meter's wavelength memory function after shutdown. 2. Used to determine the light emitting mode during the project construction process whether it is continuous / intermittent, such light source meter can accurately identify the optical fiber transmission frequency. 3. Plastic shell keeps protection to the meter, which reduces the damage to the machine caused by collision and accidental fall to a certain extent. 4. After switching the wavelength, the wavelength before and after the startup is unchanged. 5. Fiber testing tool keeps simple and convenient operation with stable and reliable performance. Specification: Item Type: Optical power meter Material: Engineering plastic Wavelength Range: 800-1700nm Input Voltage: DC3-6V Connector: FC/SC/ST Detector Type: InGaAs Measuring Range: -70 to +6 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 . Package List: 1 x Optical Power Meter1 x USB Cable Note: Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.