Final answer:
The final liquid level in the air meter is estimated to the nearest tenth, considering the smallest scale division of the measuring device.
Step-by-step explanation:
The direct reading of the final liquid level in the neck of the air meter is estimated to the nearest tenth. In general, numerical scales such as those on graduated cylinders allow measurements to one-tenth of the smallest scale division. If the scale has 1-mL divisions, volumes can be measured to the nearest 0.1 mL. Therefore, attempting to measure to the hundredth or thousandth would not be practical as the tenths place digit is uncertain.