OPPO Watch X2 could feature blood pressure monitoring, and is highly likely to be available on the OnePlus Watch 3 as well.
Blood pressure monitoring RSS
Apple is reportedly working on introducing satellite connectivity and blood monitoring features to next year's Apple Watch 3 Ultra.
Samsung has announced that its Galaxy Watch3 and Galaxy Watch Active2 have been certified for blood pressure monitoring and ECG in more countries, where the feature will be available soon.