The S423/C/OPT probe is equipped with an AISI 316 or Black rigid PVC sensor body, an interchangeable cap and non-moving mechanical parts. It can be widely utilized for the optical measuring of Oxygen specifically in both pure and processed water. Its measurement principle is generally based on the effects of the dynamic luminescence quenching by molecular Oxygen. Also, it can be applied for the purpose of measuring Oxygen in primary, industrial and recirculating water. It can offer a reliable concentration measurement through the optical measuring process.