MeterToMeterTo mainly offers instruments and tools. Please confirm the product is offered by our store MeterTo when purchasing, otherwise we can't ensure the quality and after-sale service.Fast find fiber in a mass.Indicate signal directions in fiber.Indicate Live or dark fiber.Detect 270Hz, 1kHz, 2kHz from laser source.Suitable for 0.25, 0.9, 2.0, 3.0mm fiber, no need to change adapter.Wavelength Range: 800 to 1700nm (SM) Recognizable signal type*: CW, 2kHz, 1kHz, 270Hz ±10% Detector Type: InGaAs 2pcs Fiber Type: 0.9, 0.25, 2.0, 3.0 mm fiber Sensitivity: +10 ~ -50dBm Accuracy: * +10dB to -30 dBm (Continuous Wave) /+10dB to -25 dBm (Modulated Signal) LED Indicator: Signal direction; signal frequency (2kHz/1kHz/270Hz); low battery Power Supply AA * 2