Measurement accuracy depends on what factors ?

Measurement accuracy depends on what factors ?
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The accuracy of the measurement depends on the following factors. 1. The device will not have any kind of mechanical defect , if there is a mechanical defect it will have to be diagnosed and subtracted from the text. 2. Eyes should be kept in the correct position to avoid parallax errors. 3. Avoid random errors and take average of more lessons.
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Accuracy of measurement is determined by 

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Last Answer : Answer : a