1. MULTIPLE USAGES: OTDR optical time domain reflectometer can also be used as visual fault locator and optical power meter, portable design is simple and practical.     2. WIDE APPLICATION: Used for network construction, optical fiber breakpoint identification, optical cable length measurement, and relative optical power loss calculation.     3. TESTER FEATURES: The optical fiber tester is equipped with USB data interface, built in 4400mAh lithium battery, 3.97in 800x480 IPS color touchable screen, easy to operate.     4. WORKING RANGE: The wavelength range of the optical power meter is 800& 8209;1650nm, supports 6 calibration wavelengths, and the measurement range is & 8209;50~+26dBm.     5. PLASTIC HOUSING: The shell of the optical fiber power meter is made of ABS plastic, which has good toughness and corrosion resistance, suitable for various environments.         Specification: Item Type: OTDR Fiber Optical Tester     Model: AUA28A     Connector Type: APC     OPM: -50~+26dBm     Material: ABS     Wavelength: 1550nm (20dB)     Product Voltage: 100-240V     Input Voltage: 8.4V 0.5-1A     Dynamic Range: 20dB     Measuring Distance: 0-60km     Fiber Optic Connector Type: 9/125μm SM     Test Type: FC PC; SC PC& 65288;FC APC, SC APC Optional& 65289;     Unit: Meter, Inch, Mile     Reflection Blind Area: 2 meter     Data Storage: 200 Groups     Display: 3.97in     Resolution: 800 x 480pixels IPS screen (touchable screen)     Power Supply: 7.