Instrument and unit to measure fermentation?

So basically for my science fair project I am trying to test how well yeast ferments polysaccharides and disaccharides. But my science teacher says yo

So basically for my science fair project I am trying to test how well yeast ferments polysaccharides and disaccharides. But my science teacher says you must have some sort of instrument for measurement and she says we also have to say which unit it will be measured in. I don't have any idea on either of those because I was planning on just counting the carbon bubbles that appear. Help would be greatly appreciated!

or:So basically for my science fair project I am trying to test how well yeast ferments polysaccharides and disaccharides. But my science teacher says you must have some sort of instrument for measurement and she says we also have to say which unit it will be measured in. I don't have any idea on either of those because I was planning on just counting the carbon bubbles that appear. Help would be greatly appreciated!

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