The Chairman and members of an SPSC are appointed by the Governor of the state.
However, they can only be removed by the President of India, not the Governor.
The President can remove them on grounds such as proved misbehaviour or incapacity, after a reference is made to the Supreme Court for an inquiry.
Other grounds for removal by the President include being an undischarged insolvent, engaging in any paid employment outside the duties of his office, or being, in the opinion of the President, unfit to continue in office by reason of infirmity of mind or body.
This 'appointment by Governor but removal by President' mechanism highlights the independent nature of the SPSC and protects its members from arbitrary removal by the state executive