OWL WS-MDst Wavesource Multi Mode Fiber Light Source is an advanced fiber optic light source that is economically priced and provides high and consistent output. The OWL WS-MDst 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-MDst also carries a NIST calibration and can perform auto-wavelength adjustment during testing when used in conjunction with an OWL Wavetester.