Feature: 1. Simple Operation: The fiber identifier can be tested online without changing fixtures, and is universal for single mode and multi mode 2. Multi Frequency Identification: The optical fiber identifier can identify 270Hz, 1KHz, 2KHz signal frequency 3. Buzzer Prompt: The handheld fiber optic identifier has buzzer sound indicate when identifying the frequency 4. LED Light Display Direction: This fiber identifier can accurately identify the fiber direction which LED indicator light can show left and right 5. Excellent ABS Material: The fiber optic identifier is made of high quality ABS material, has high strength, not easy to damage, sturdy and durable Specification: Item Type: Optical Fiber Identifier Material: ABS Battery: 1.5V 2 x AA battery (not included) Application: Optical fiber identification Basic Parameter: Wavelength Range: 800-1700nm Signal Identification Type: CW, 270Hz±5%, 1KHz±5%, 2KHz±5% Detector Type: Diameter 1mm InGaAs 2 pcs Adapter Fiber Type: Universal diameter 0.25 (bare fiber), 0.9, 2.0, 3.0 fiber jumper Signal Direction: LED indicate left and right direction Optical Power Reading Range: -40dBm to +10dBm Signal Frequency Range: 270Hz, 1KHz, 2KHz Red Light Test Wavelength: 650nm±10nm Red Light Output Power: >10mW Working Temperature: -10℃ to +60℃ Storage Temperature: -25℃ to +70℃. Package List: 1 x Optical Fiber Identifier1 x Manual1 x Storage Bag