name two instruments that can be used to measure length.explain how a ruler can be used to measure length.

Dear Student,

The instruments that can be used to measure length are:
• Ruler
• Vernier caliper 

We should follow these points while using a ruler to measure any length: 
• First place the ruler along the line you wish to measure as close to it as possible.
• Now you should keep your eye exactly above the point at which your making your measurement. Its better one keep one eye closed while making the measurement.
• Try and make three measurements and take their average to get an accurate measurement..
• Preferably a non metallic ruler(like plastic or glass) is to be used in extreme temperatures,to avoid errors arising from thermal expansion and contraction of the metallic ruler.


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