Handheld SG13WD15 Fiber Optic Light Source, FTTH 1310/1550nm Fiber Tester Communication Instrument ,Easy Use

Provides 2 output wavelengths which can be optional according to customers needs CW, 2Hz modulation output at 650nm, and CW, 270Hz,1KHz,2KHz modulation output at other wavelengths High stability of the output power Stable output wavelength