All / Respirometers All Respirometers Quick View OxiTop IDS BOD Self Check and Aerobic Degradation System $0.00 Request Sales Quote Quick View BOD Measuring system OxiTop-i $0.00 Select System 208260 WTW Oxitop-i IS 6 Measuring Units 208262 WTW OxiTop-i IS 12 Mesuring Units NHP 600 Sodium Hydroxide Pellets (2 bottles/50 g each) Request Sales Quote