If a person's blood pressure isn't good(goes very high) in some circumstance . should he wear smart watch that give the blood pressure?

High blood pressure: It really depends on the history of the blood pressure. What circumstances, how high it goes, whether associated with any symptoms or not, any other medical conditions present or not. You can wear a smart watch to track the BP, but when it shows high or low reading confirm with an actual machine that goes on the arm and not the wrist. Always consult a doctor if happening frequently or too high.