The EasyPREP COD-200 is an automated chemical oxygen demand (COD) analyzer.Features include automated digestion, sample time tracking, mixing, analysis (built-in spectrophotometer), data transposition and storage. Accu SPEC COD Digestion Tubes are standard 16 mm tubes that have been prefilled with the digestion reagent. . The solution contains mercuric sulfate (HgSO4) to remove up to