Sounds too awesome to be true, This business card "electroCARDiograph" measures the real ECG signal between the users hands. While this is not a diagnostic grade ECG, the company MobilECG offers open-source, diagnostic grade, small and affordable ECG machine costing between $100 – $150 which uses different data collection points to give accurate readings.

Users can resister their interest to order the "ECG toy-card" for ~ $29 here, and the affordable ECG device here.