Feature: 1. ACCURATELY IDENTIFY: Optical fiber identifier accurately identify the direction of the optical fiber. When the optical fiber has a signal, the left and right direction indicator shows the signal direction. 2. AUDIBLE WARNING: Optical fiber identifier can do effective identification of traffic direction and frequency tones (270Hz, 1KHz, 2KHz) with audible warning. 3. Visual Fault Locator VFL: The optical power meter is built in VFL red lighting visual fault locator can measure a distance of about 10km. 4. Optical Power Reading Range: This meter optical power reading range is ‑70dBm ‑ +10dBm and optical power meter wavelength range is 850‑1650nm. 5. Made of ABS Material: Our VFL optical power meter identifier is made of ABS material and light in overall weight for simple carrying. Specification: Item Type: Fiber Optic Identifier Material: ABS Battery: Lithium Polymers 3.7V 650mAh (Shipped With Built In Battery) Use: Fiber Optic Identification Wavelength Range: 800-1700nm Signal Recognition Type: CW, 270Hz±5%, 1kHz±5%, 2kHz±5% Detector Type: 1mm Diameter InGaAs 2 Pcs Adaptation Fiber Type: Universal Diameter 0.25 Or Diameter 0.9 (For Bare Fiber), Diameter 2.0, Diameter 3.0 (For Pigtail) Signal Direction: LED Indicator Left And Right Direction Indication Optical Power Reading Range: -70dBm - +10dBm Display Resolution: Linear Display 0.1%. Logarithmic Display, 0.01dBm Optical Power Meter Wavelength Range: 850-1650nm Red Light Source Use Distance: Greater Than 10km Operating Temperature: -10 - +60℃ Storage Temperature: -25 - +70℃. Package List: 1 x Optical Fiber Identifier1 x Manual1 x USB Cable1 x Storage Box