Features Accurate Identification: The tester can be used to judge whether the luminous mode is continuous or intermittent during the construction of the project. This light source meter can accurately identify the transmission frequency of the optical fiber. Record of the Last Use Can Still Be Kept: The optical power meter by the mini optical power meter before shutdown can be memorized after shutdown through the wavelength memory function of the optical power meter. Easy to Carry: After the tester switches the wavelength, the wavelength remains the same before and after starting up. It adopts professional design and has a compact appearance, which is easy to carry and use. Stable Use Performance: The operation of the optical fiber tester is very simple and convenient, and the use performance is stable and reliable. It is a very practical testing instrument. Engineering Plastic Shell: The engineering plastic shell can protect the instrument to a certain extent, and reduce the damage to the machine caused by collision and accidental drop to a certain extent. 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. Package List 1 x Optical Power Meter 1 x USB Cable