3 Precautions when using a metre ruler
Point 28 of 30 — Chapter 1: Physical MeasurementQuestion bank: 0 questions (0 with pictures)
28 8.3 Precautions when using a metre ruler
- Choose a ruler with suitable graduation and check that its end is not worn.
- Place the zero mark exactly at one end of the object (or use another mark and subtract).
- Keep the ruler along the length being measured, with its graduated edge in contact with the object.
- Keep your eye vertically above the reading mark (line of sight perpendicular).
- Repeat several times and take the average.
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