What is the difference between instrumentation and mechanical engineering?

What is the difference between electrical tools and measuring instrument

Mechanical engineering: It is the branch of engineering that involves the production and usage of heat and mechanical power for the design, production, and operation of machines and tools.

,Instrumentation engineering: It is the branch of engineering that specialises on the principle and operation of measuring instruments that are used in fields of design, configuration of automated systems in electrical, pneumatic, hydraulic.

Instrumentation engineers can work in a number of fields including manufacturing, defense, biomedicine, and government.