while taking a reading The eye of the observer should be using a ruler.
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Explanation: In such conditions the eyes of the observer should be study and straight in front of the scale. There should be no angle other than 90° between the point of visibility and the scale.
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In such conditions the eyes of the observer should be study and straight in front of the scale. There should be no angle other than 90° between the point of visibility and the scale.
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