Basiccally Instrument as a device to measure non visual measure value such as pressure, level, flow, temperature, speed and others.
Let us take an example:-
Do you know your enviroment temperature surounding you know?
The answer you can give is only hot or cold only. ( Hot and cold is not a measure value)
You need a device to measure the temperature is't?
Yes, you need a temperature monitoring device. It will giving a numericle value with unit degree C or Farenheit. For examplewe use thermometer to measure it (refer to pictur below).
Is't simple?
Measurement in I&C
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