What is the approximate salary of a medical equipment engineer?

Not bad as far as you are concerned. R&D personnel should have an R&D bonus. This figure should be the salary during the probation period. It will be higher after formal employment. R&D personnel mainly have their own achievements. You just graduated and have no experience in this industry, even if you think the salary is low now. You can still change jobs in the future, and you will have work experience then.