Feature: 1. Calibration Function: The power measurement range is ‑50 to +26dbm, relative to the power calculation, with calibration function, can produce faster and more accurate data, very convenient. 2. Low Battery Consumption: This optical power meter has a sensitive chip and a sturdy internal structure. The battery consumption is low and can work continuously for 40 hours with high endurance. 3. 7 Wavelengths And Light Sources: Seven wavelengths are 850, 980, 1300, 1310, 1490, 1550 and 1625nm, as well as SC, FC, ST adapters. Cover most of the needs of communications engineering maintenance. 4. Easy Carry: This optical power meter does not need to wait for preheating, plug and play, small size, light weight, easy to carry, but also with LED light, very practical. 5. Clear Blue Screen: This optical power meter has clear blue screen. Details mean professionalism, and a clear display of results or information can enhance the user experience. Specification: Item Type: Optical Power MeterModel: AUA G510B Material: ABS Output Optical Power: >20MW Output Distance: 20KM Power Supply: Requires AA batteries x2 (shipped without batteries) Power Measurement Range: -50 - +26dbm Probe Range: InGaAs Wavelength Range: 850-1625nm Standard Wavelength (nm): 850, 980, 1300, 1310, 1490, 1550, 1625 Display Resolution: Linear display 0.1%, logarithmic display 0.01dBm Operating Temperature: -10 - +60℃ Storage Temperature: -25 - +70℃ Auto Shutdown Time: 10 minutes Battery Life: Not less than 40 hours. Package List: 1 x Power Meter 1 x FC Adaptor 1 x Manual Note: Please pay attention to the correct operation