When using the oxygen indicator, which reaction from the needle should you expect as a sample is drawn into the instrument?

Correct Answer: Option A — Move back and forth and finally stabilize at the correct reading after about 10 seconds

When drawing a gas sample, mechanical and chemical interactions within the sensor cause the meter needle to oscillate before stabilizing. Mariners must wait for this stabilization period, typically around 10 seconds, to obtain an accurate oxygen percentage reading.