Modifies a noun

• tubing: Effectively one long air stone, bubbler tubing is simply a length of tube which allows air to diffuse through it.

• bottle: As the oxygen rises it passes through water in the bubbler bottle at the bottom of the machine.

• monitoring: What QA/QC procedures do I need to implement for SO 2 bubbler monitoring?

• method: Data from the Network cannot be directly compared with this standard, as the bubbler method provides only daily means.