Simplify BOD analysis with the BODTrak™II Respirometric BOD Apparatus. Results comparable to the dilution method can be achieved in only two to three days. Use these results for process control or as a complement to the dilution method (not approved by USEPA for NPDES reporting purposes). The BODTrak II is a re-engineered version of the original Hach BODTrak. Improvements to the old system include greaseless bottle seals, a larger graphical display, improved stirring and temperature control, a smaller footprint, improved procedures with expanded options, an auto-switching power supply, and bottle fences to prevent tipping of bottles.