Answers

2016-03-16T18:05:15+05:30
Instruments for determining various quantities such as temperature, mass, height, length.

They are also used for determining various quantities such as voltage, time and mechanical force and pressure.

There are various types of instruments some are :
Electricity meter, gas meter, spring balance, thermometer, measuring scale etc.

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2016-03-16T22:22:17+05:30
It helps you to know the size of an object
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