Mention the various precautions that you keep in mind while talking measurement of the length of a object
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1) Make sure your measuring instrument lacks a zeroing error.
2) Keep your eye level proper to avoid parallax error
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It should be apparent that the move into modern times has greatly refined the conditions of measurement for each basic unit in the SI system, making the measurement of, for example, the luminous intensity of a light source a standard measurement in every laboratory in the world. A light source made to produce 20 cd will be the same regardless of whether it is made in the United States, in the UK, or anywhere else. The use of the SI system provides all scientists and engineers with a common language of measurement.
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