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Instrumentation engineeringis a specialized branch ofelectricalandelectronic engineeringand it deals with measurement, control and automation of processes. ... Nature of work of aninstrumentation engineerranges from designing, developing, installing, managing equipment that are used to monitor and control machinery.

the job opportunities for core instrumentation jobs are high, and will stay high as it is a crucial part of any system (especially cars and in industrial processes). You will also get lots og opportunities for higher education and PSU jobs (think GATE). I did qualify for GATE, and preparing for this exciting exam will round off your undergraduate studies in Instrumentation (something like 610 core Instrumentation papers, depending upon the college). It is a nice branch to study Engineering.

All the best