A moral barometer is a trusted person who will advise or act in such a way as to protect and guide someone or something.
Paul had a decision to make about his relationship with Jenny. So he turned to his moral barometer Jack for advice and guidance.

Sharon had met with a dodgy salesman who was pushing her into making a decision. She contacted her moral barometer Frank who gave her the advice and encouragement she needed to manage the situation in her favour.
by ear2ground June 14, 2010
Get the Moral Barometer mug.