1. The identifier can directly test 0.25mm bare fiber, 0.9mm pigtail, 2mm or 3mm fiber jumper without need to change the adapter frequently.2. Can identify CW, 270Hz, 1Hz, 2KHz signal.3. Left and right LED indicator shows the transmission direction of the signal.4. ABS plastic outer case, wear resistant and comfortable hand feeling.5. Compact and lightweight, easy to carry.Wavelength Identification Range: 800~1700nm Identification Signal Type: CW, 270Hz5%, 1KHz5%, 2KHz5% Detector Type: 1mm InGaAs 2pcs Adapter Type: For 0.25mm bare fiber, 0.9mm, 2.0, 3.0mm optical fiber Signal Direction Indication: Left and right LED indicator Optical Power Reading: -40dBm to 10dBm Signal Frequency: 270Hz, 1KHz, 2KHz Power Supply: 2 x AA batteryWorking Temperature: -10 to 60 Storage Temperature: -25 to 70 Material: ABScolour: As shownPackage Contents:1 x Fiber Optic IdentifierOnly the above package content, other products are not included.Note: Light shooting 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.