This is BP Diary app, It don't measure your blood pressure. Not using any device sensors and not connecting to any external device that can measure bp.
You need to log your blood pressure and see charts over selected period. This is Diary app with charts and export pdf documents.

Tack, log your blood pressure. Nice UI and interface. Support Health kit synchronization.

Automated analitics calculation:
View MAP analitics and trends over selected time period.
View systolic blood pressure "Sys" and diastolic blood pressure "Dia" trends over selected period
View blood pressure "BP" overview trends over selected period.
View mood, body position, arm and influance on your BP trends.
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