| When using the oxygen indicator, which reaction from the needle should you expect as a sample is drawn into the instrument? |
| A) Move back and forth and finally stabilize at the correct reading after about 10 seconds |
| B) Rise to the correct reading and then, slowly fall to zero as the oxygen in the sample is consumed |
| C) Slowly rise to the correct reading and then remain stationary |
| D) Rise to the correct reading immediately and then rise slowly to a false reading as the operating temperature increases |
