Photometric determination of BOD5. • Tube test for the determination of the biochemical oxygen demand in 5 days (BOD5) by using the diluting principle according to the German Standard Method DIN 38409-H51. • The incubation of the samples is carried out in Winkler oxygen flasks. The determination of oxygen dissolved in water at day 0 and after 5 days is carried out similarly to the Winkler Method DIN EN 25813-G21 by photometric evaluation of iodine-colour. • Type: Winkler bottles test 8-22 • Range: 2 - 3000 mg/l O2 Sufficient for: 25 - 50 determinations • Sea water suitability: yes