Is there a way to measure air content without commercial equipment?

You can't measure any response without something against which to measure it.

There is no difficulty at all in measuring air pressure without mercury.

He wasn't someone next to whom anyone else can be measured without the help of a large footstool.

No day or night could be measured without the motion of the Earth revolving.

But change cannot be measured without a starting point, and Manchester's was pretty grim.

There may be other ways to measure without tracking, and I guess we'll have to find those ways.

The technology also allows a person's heart rate to be measured from a webcam without the person wearing anything.

He also devised a method for measuring the apparent size of a star without a telescope.