Deficient oxygen content inside a chain locker can be detected with __________.
Official USCG Answer & Rule Citation
Correct Answer: Option B — oxygen indicator
An oxygen indicator specifically measures the percentage of oxygen present in a sampled atmosphere. It is the correct instrument for detecting oxygen-deficient conditions inside enclosed spaces like chain lockers caused by oxidation or displacement.
100% Free & Open Access — No daily limits, paywalls, or gated answers on BrightMariner.