Indicate the signal directions and power in fiberIndicate the signal presence or absence(Live or dark fiber)Efficiently identifies the traffic direction and frequency tone (270Hz, 1KHz, 2KHz) with audible warningDisplays the relative 't need to replace adaptor;Lower power indication;Build in VFL functionSpecificationModel Number: -40Weight: 0.18kgWavelength identification range: 800~1700nmOptical fiber type:3.0/2.0/0.9/0.25mmIdentify signal frequency:270KHZ/1KHZ/2KHZAccuracy:+10db~-30dBm(Continuous)+10db~-25dBm(Wave modulated signal)Sensitivity range:+10db~-50dBmOutput wavelength:650 +/- 10nmcolour: black + blueMaterial: plasticsize: 28x21x240mmPackage Contents: 1*Fiber Optic Identifier1*bagOnly the above package content, other products are not included.Note: Light 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.