By keeping Ur eyes perpendicular to the vernier and main scale while taking the measurement.
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View the meniscus from a 0/180 degree angle.. i.e hold it up to your eyes and take the measurement from the base of the meniscus.
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If you are going to measure out a different solution, you must rinse and drain well to avoid contaminating one substance with another. If you are using the same solution, there is no need to rinse, and in fact it is better not to do so, because the rinsings will dilute the next batch.
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Avoid eye contact.