ruler
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- measures less than 30 cm or 1 foot
- precision to a tenth of a centimetre (nearest millimetre) or
«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»
«mfrac»
«mn»1«/mn»
«mn»16«/mn»
«/mfrac»
«/math» in
- example: used for measuring the length of a piece of paper
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measuring tape
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- measures more than 30 cm or 1 foot
- precision to a tenth of a centimetre (nearest millimetre) or
«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»
«mfrac»
«mn»1«/mn»
«mn»16«/mn»
«/mfrac»
«/math» in
- example: used for measuring the length of a piece of lumber or dimensions for a sewing pattern
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micrometer
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- measures small items less than 15 mm
- precision to a thousandth of a millimetre
- example: used for measuring the diameter of a bolt or the thickness of a penny
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calliper
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- measures small to medium items
- measures depth and inside and outside dimensions in centimetres or inches
- precision to the tenth of a millimetre or
«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»
«mfrac»
«mn»1«/mn»
«mn»64«/mn»
«/mfrac»
«/math» in
- example: used for measuring the inside dimension of a washer or pipe or the outside of a bolt
- can measure odd-shaped items like the length of a small pumpkin due to the two long, thin pieces of metal joined together
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trundle wheel
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- measures in metres or yards
- measures long distances, usually over rough terrain
- not very accurate, but gives a good estimate
- example: used for measuring the dimensions of a running track
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