The Dual OWL is a cost effecitve handheld light source. The tempreature cmpensated outputs are calibrated to couple the optical power into multimode fibre. The units are available in slge 850nm or 1300nm versions. Ease of use is assured iwth a single switch controlling power and output wavelength selection. LED indicators highlight the selected source and verfy that battery power is sufficient to maintain the calibrated output power.