Heart beat observer pro is ad-free version of free application to measure and monitor your heart beat rate. You can try free version first for understanding functionalists. If you liked the app and want to permanently remove ads, you can use this paid version. If you still don't know anything about application and want to evaluate check the free version first from below developer link.This application measures your heart beat rate and display live ECG on your smartphone/tablet screen. You can measure it , watch live and but compare it manually.
On screen instruction and basic calculation will help you to understand more about basic calculation and errors. Long term and short term average will be saved for reference.