Compare analog and digital instruments .
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Analog Instrument
Digital Instrument 
1 Principle
The instrument that displays analog signals is called as on analog instrument.  The instrument that displays digital signals is called as a digital instrument.
2 Accuracy
The accuracy is less.
The accuracy is more. 
3 Resolution
The resolution is less
The resolution is more.
4 Power
Requires more power.
Requires less power.
5 Cost
Analog instruments are cheap
Digital instruments are expensive.
6 Observational errors
Analog instruments have considerable observational errors. 
Digital instruments are absolutely free from the observational errors. 
7 Examples
PMMC instrument, Potentiometer, DC ammeter, DC voltmeter, etc.
Logical analyzer, signature analyzer, computers, microprocessor based instruments, etc. 

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