Instrumentation and Control Engineering

The scope is very good.
Being an Instrumentation Engineer myself, I can say that without a doubt.
I hope you might be aware about Instrumentation and control Engineering and its Applications. If not, Please read the other answers in which people have clearly mentioned about Instrumentation Engineering and the Industries where it is extensively dealt with.
Coming back to your question, There is abundance of Scope in the Middle East and other Oil rich states. There are many Oil & gas, Chemical and petrochemical companies who hire Instrumentation Engineers and once you gain sufficient experience(5+ Years) you get paid also very well.
You can get into Designing of Plants, Maintenance activities, Or even into Commissioning of New plants.
This stream is sub divided into two parts. 1. Automation and control 2. Design and Detail engineering.
But one thing, as they say Every dog has it's day. Sometimes the IT industry goes into recession, sometimes some other industry. So now the Oil & gas industry is struggling a lot . Hence a lot of companies are laying off people and most of the projects related to New plants are on Hold.
So this has affected the Job market a lot. So everyone from Mechanical engineer to Civil Engineer who work in this field are affected and instrumentation people being an important Part of this industry are also affected.
So Instrumentation is a very good field for making your career and about the Scope, you know you really can't predict much.
Thanks. :)

In short, huge. Robotics is becoming a worldwide phenomenon and India is slowly catching up to it. Robotics involves mainly 34 thing -Instru and control, AI, Embedded Systems, Coding.
As the future of robotics is huge Instru and control will also rise. There is anyway a shortage right now of good Instrumentation engineers.
Furthermore with IT companies removing people for automation, instrumentation and control assumes greater importance. Automation of human jobs requires control theory basically along with AI. So I'm sure along with AI, Instrumentation and Control will be the next boom, not just in India but across the world.
The Indian army is stocking up with autonomous robots.
The next big thing is autonomous cars as you may have read. They have huge scope for control engineers.