health check up app with finger : Instant Heart Rate

Instant Heart Rate is the most accurate heart rate monitor. Trusted by top research institutions such as UCSF for cardiology research training, and used in UCSF Health eHeart Study for its accuracy.
Measure accurately your pulse and heart beat zone with your heart rate & health monitor after sleeping or during workouts & training. Instant Heart Rate doesn’t require heart rate straps. Monitor blood circulation with accurate heart health monitor (similar to ECG or EKG). Functions similarly to pulse oximeters, detecting change in your finger to provide accurate heart beat measurements.