Features: Optical fiber identifier, visual fault locator, online testing, does not require fixture replacement, singlemode and multimode are general purpose. 270Hz, 1kHz, 2kHz three signal frequencies can be identified, there is a beep when identifying the frequency. Exquisite workman and comfortable hand feeling, the operation is simple and convenient. The microbend test technology can accurately identify the direction of the optical fiber. When the optical fiber has a signal, the left and right direction lights show the signal direction, and the left direction light lights up to indicate that the light source is from right to left. Ergonomic design, when grip the machine, press the trigger switch with the index finger, then clamp the optical fiber line and the machine will test automatically. 4in1 universal fixture, suitable for 3.0mm, 2.0mm, 0.9mm, 0.25mm optical fiber line. Equipped with 10mw red light source and white LED light, stable and powerful, focused beam, effective with line detection. Specifications: Name: Fiber Optic Identifier Material: plastics Battery: 2 * AA battery (not included) Bandwidth identification ranges: 800-1700nm Frequency: 270Hz/1KHz/2KHz Sensitivity ranges: +10 to -50dBm Accuracy: +10dB to -30dBm(CW); +10dB to -25dBm (modulation signal) Voice prompt: Yes Auto power-off: Yes Output power: & 65310;10mw Output wavelength: 650±10nm Item size: 240 * 45 * 80mm / 9.45 * 1.77 * 3.15in Package size: 255 * 70 * 85mm / 10.04 * 2.76 * 3.35in Package weight: 310g / 10.93ounce Packing List: 1 * Fiber Optic Identifier 1 * Storage Box