Feature:1. Simple Operation: The fiber identifier can be tested online without changing fixtures, and is universal for single mode and multi mode2. Multi Frequency Identification: The optical fiber identifier can identify 270Hz, 1KHz, 2KHz signal frequency3. Buzzer Prompt: The handheld fiber optic identifier has buzzer sound indicate when identifying the frequency4. LED Light Display Direction: This fiber identifier can accurately identify the fiber direction which LED indicator light can show left and right5. Excellent ABS Material: The fiber optic identifier is made of high quality ABS material, has high strength, not easy to damage, sturdy and durableSpecification:Item Type: Optical Fiber IdentifierMaterial: ABSBattery: 1.5V 2 x AA battery (not included)Application: Optical fiber identificationBasic Parameter:Wavelength Range: 800-1700nmSignal Identification Type: CW, 270Hz5%, 1KHz5%, 2KHz5%Detector Type: Diameter 1mm InGaAs 2 pcsAdapter Fiber Type: Universal diameter 0.25 (bare fiber), 0.9, 2.0, 3.0 fiber jumperSignal Direction: LED indicate left and right directionOptical Power Reading Range: -40dBm to +10dBmSignal Frequency Range: 270Hz, 1KHz, 2KHzRed Light Test Wavelength: 650nm10nmRed Light Output Power: >10mWWorking Temperature: -10 to +60Storage Temperature: -25 to +70.Package List:1 xOptical Fiber Identifier1 x Manual1 x Storage Bag