The kit includes an overflow funnel and spacer. The funnel has a built-in magnetic stirrer, which eliminates the need to retrieve stir bars from BOD sample bottles. DO measurements can be made without spilling sample, because the funnel provides an overflow reservoir. The funnel also acts as an electrode holder when using the spacer. BOD bottles and caps BOD bottles feature tapered ground glass stoppers to prevent air entrapment.
Bottles have a flared lip that provides a good water seal.
Each bottle has a frosted marking area for labeling. Plastic BOD bottle caps easily snap onto 300-mL BOD bottle tops. These optional caps prevent water seal evaporation and minimize testing error.