Traditional dissolved oxygen (DO) measurements require high maintenance and frequent calibrations due to the consumptive nature of galvanic and poloragraphic technologies used. Hach Co., of Loveland, Colo., has developed a new breakthrough in DO measurement. HachLDO measures DaO using a unique luminescent measurement technique. This technique doesn’t consume the oxygen and requires no electrodes or electrolyte. This means that frequent calibrations are a thing of the past.