it is used to hold a substance or liquid.
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A beaker is a cylindrical container used for holding, mixing, and heating liquids in a laboratory setting. It is commonly used for measuring and pouring liquids during experiments. Beakers are not as precise as laboratory glassware like graduated cylinders, but they are versatile tools for a variety of basic lab tasks.
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You must obtain and subtract the mass of the beaker.
You can do that or you can zero balance the scale with the empty beaker on it before adding the substance to be measured to the beaker.
Beaker
Those are called beaker tongs. They have rubber-coated ends to provide a secure grip on the beaker without damaging it.