Feature: 1. IDENTIFY FIBER DIRECTION: Micro bending testing technology accurately identifies fiber direction. When the fiber has a signal, the left and right direction lights display the signal direction. 2. LED LIGHT: Equipped with a red light source, the LED light is stable and powerful with concentrated beam, effectively cooperating with circuit detection, and there is no need to interrupt the light source during online testing. 3. EASY TO OPERATE: Simple, fast, and convenient, equipped with a light hood to provide the most accurate test results. 4. WIDE MEASUREMENT RANGE: This optical tester can provide from 800 to 1700nm optical power measurement range. And has a test distance 5000 to 8000m. 5. ABS MATERIAL: Made of premium ABS material, this optical fiber tester possesses scratch resistant and impact resistant, has a long service life. Specification: Item Type: Optical Fiber Identifier Material: ABS Wavelength Recognition Range: 800 to 1700nm Signal Recognition Type: CW, 270Hz ± 5%, 1kHz ± 5%, 2kHz ± 5% Detector Type: Dia. Approx. 1mm / 0.04in for InGaAs 2 pcs Common Types of Adaptive Optical Fibers: Dia. Approx. 0.25mm / 0.01in (bare fiber), Dia. Approx. 0.9mm / 0.04in, Dia. Approx. 2mm / 0.08in, Dia. Approx. 3mm / 0.12in fiber optic cable Signal Direction Indicator Light: Left and right direction indicators Optical Power Reading Range: -40 dBm to 10 dBm Signal Frequency Range: 270Hz, 1kHz, 2kHz Working Temperature Range: -10 ℃ to 60 ℃ Storage Temperature Range: -25 ℃ to 70 ℃ Battery: AA x 2 (shipped without battery) Optical Power Meter: - 70 to +6dbm Test Distance: Approx. 5000 to 8000m / 16404.2 to 26246.7ft Wavelength Range: 650nm Laser Type: LD LED Flashlight: Support . Package List: 1 x Optical Fiber Identifier 1 x Storage Bag Note: Four in one universal fixture, no need to replace the fixture for online testing, ensuring no damage to the optical fiber.