Ocean Optics sensor systems are ushering in a new generation of low-cost, portable chemical-sensing devices. Thanks to innovation in the development of chemical-sensing complexes -- particularly those with fluorescing properties -- products such as our Oxygen Sensor systems will continue to provide viable alternatives to traditional chemical-sensing devices such as electrodes. The use of optical-sensing methods lessens the reliance on the electrochemical technologies that have dominated the field of oxygen sensing.