Features Simple Operation: Supports downstream mixed optical signal measurement and up burst emission signal measurement. When the current light power exceeds the preset threshold, the LED indicator light on the display screen will light up. Smart Testing: The PON optical power meter is used to measure the optical power of up and downstream optical signals of ONU and OLT devices in PON networks. It can achieve online measurement through bidirectional ports and is compatible with network type. Premium Design: High testing accuracy, fine workmanship, easy to carry, soft silicone protective cover, reducing damage caused by collisions and falls. Wide Test Range: Equipped with FC SC UPC interface adapter. Pon power meter testing wavelength of 1310nm, 1490nm, 1550nm, capable of testing three wavelengths simultaneously. Online testing ensures communication between OLT and ONT. Other Functions: Supports data storage, automatic shutdown, backlight selection, automatic calibration, user calibration, and threshold setting. Specification: Item Type: Optical Fiber Power Meter Model: SKL-300U Material: ABS Display: LCD Screen Detector Type: InGaAs Power Supply: 2 x AA alkaline dry battery, shipped without battery. Testing Wavelength: Can simultaneously test three wavelengths of 1310nm, 1490nm, 1550nm. Optical Power Meter Interface: SC FC interface, providing SC UPC and FC UPC adapters.  Package List: 1 x Optical Fiber Power Meter 2 x Adapter Package List 1 x Optical Fiber Power Meter 2 x Adapter