What are the two main classifications of analog instruments?

What are the two main classifications of analog instruments? 
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1 Answer

Answer :

The two main classifications of instruments are,

a. Absolute instruments. Example tangent galvanometer.

b. Secondary instruments. Example ammeter, voltmeter. Analog instruments are classified according to their electrical quantity they measure. Example frequency meter, voltmeter, etc. Principles they work are moving coil, induction. 
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