The Dual OWL 1300 is a cost effective, compact, handheld light source. The temperature compensated outputs are calibrated to couple -20dBm of optical power into multimode fiber. The light source is offered with a single 1300nm source installed, and can be easily upgraded to include a 850nm source. The source is simple to operate with two buttons controlling power and selecting the output wavelength. LED indicators highlight the selected source and verify that battery power is sufficient to maintain the calibrated output power.