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The measuring cup used must be for fluid ounces if measuring a liquid. Dry cups will not give as accurate of a reading because they are designed to measure weight instead of volume.. Choose a measuring cup that measures in ounces or can be easily converted to it. Lay the cup on as even of a surface as possible, like a table. Avoid holding the cup in your hand while measuring, as the reading will be slightly off. Fill the measuring cup until it reaches slightly underneath the level you are hoping to reach. Squat down until you are about eye level with the line to check your measurement, as looking from above can give you a warped measurement. While measuring liquid ounces, you may notice that the top of the surface is not even and may curve along the edges. This curve is called the meniscus. For the most accurate reading, the bottom (not the top) of the meniscus should reach the desired line.
Use a fluid measuring cup if you are handling a liquid. Place the measuring cup on a flat, stable surface. Pour the liquid to approximately the desired line. Adjust the measurement until the bottom of the meniscus reaches the line.