Answer is:
Holes, recesses slots and steps
Explanation:
Vernier depth gauge is used for the measuring Holes, recesses slots and steps
![Vernier depth gauge is used for the measuring of](https://mcqfinder.in/uploads/images/question-papers/isro-technician-b-fitter-2018-set-1/isro-technician-b-fitter-2018-set-1-id-56-e.jpg)