The American Heart Association recommends that people with high blood pressure regularly measure and track it to report back to their healthcare provider. Check, change and control your blood pressure with our Blood Pressure Wallet Card. Measures 2.5" x 3.5" when folded and fits perfectly into any wallet. Unfolded it measures 12.5" x 7" and includes a logbook for daily blood pressure readings, patient instructions for self-monitoring and blood pressure category chart.