0.01 – 0.10 mL pipetter and pipet tips; other pipetters or pipettes may be used. vi. Hach COD pre-mix digestion reaction solution vial/cuvettes vii. Class "A" volumetric and other labware . x. Reagents and standards . a. Reagents i. The Hach COD low range digestion solution contained in the pre-mixed vial/cuvettes, (catalog # 21258-15 or