edge Dedicated Dissolved Oxygen Meteredge's groundbreaking design is the culmination of Hanna's vision, design capabilities, integrated production and world class R&D. edge is a single meter that can measure Dissolved Oxygen and is incredibly easy to use. edge utilizes a " diameter Clark type polarographic DO probe with replaceable PTFE membrane caps. This small diameter probe is ideal for many applications including those that require in situ DO measurement such as in a wine bottle.