Optical Fiber Recognition Instrument: Comes with red light and LED lights to meet the needs of the work, high-efficiency line measurement, easy to operate Can identify 3 kinds of signal frequencies: there is a buzzer sound when identifying the frequency 270Hz 1KHZ 2KHZ Four-in-one universal fixture: suitable for 0.250.92.03.0mm online test without changing the fixture Single-mode and multi-mode universal: can be detected anywhere in single-mode and multi-mode fibers Equipped with high-brightness LED lighting, with stable light and strong , it is convenient for line inspection and construction in dark environments. Fiber penetration test distance up to 10KM Use 2 AAA dry batteries: Press the test switch and the screen will automatically display the measurement data Press down (Note: (without batteries) NameFiber optic recognition instrument red all-in-one machine Compatible fiber type:Universal 0.25 (bare fiber), 0.92.0, 3.0 fiber optic jumper wavelength identification range: 800~1700nm Identification signal frequency: CW, 270Hz5%lkHz5%2kHz5% Accuracy: +10dB~-30dBm (continuous wave) +10dB~-25dBm (modulated signal) Signal direction: signal light display Detector type: 1 mm Ingaas2pcs Red light test wavelength: 650nm 10nm Red light output power: 10mw knot Voice prompt: yes Colour:black Material:plastic Package Contents: 3 x Fiber Optic Identifier Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.