What Are The Classification Of Measuring Instruments?

What Are The Classification Of Measuring Instruments? Absolute instrument & Secondary instruments: Analog and Digital instrument: Mechanical, Electrical and Electronics Instruments: Deflection and Null Output Instruments: Self-operated and Power-operated Instruments: What are the classification of measurement? Psychologist Stanley Smith Stevens developed the best-known classification with four levels, or scales, of measurement: nominal, ordinal, interval, and