OWL WS-SDsc Wavesource Single Mode Fiber Light Source is an advanced fiber optic light source that is economically priced and provides high and consistent output. The OWL WS-SDsc is designed with temperature-compensated outputs, a simple and intuitive four button interface, clear LED indications, and battery indication to properly monitor output. The OWL WS-SDsc also carries a NIST calibration and can perform auto-wavelength adjustment during testing when used in conjunction with an OWL Wavetester.