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Ecg Module Ad8232 Ecg Measurement Pulse Heart Ecg Monitoring Sensor Module Kit For Arduino Ad8232 Monitor Diy Kit - Instrument Parts & Accessories - AliExpress
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Electrocardiography for Cheap: DIY ECG Uses One LM741 Op-Amp, Five Resistors, and 'Penny Electrodes' « Adafruit Industries – Makers, hackers, artists, designers and engineers!
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Inexpensive and flexible nanographene-based electrodes for ubiquitous electrocardiogram monitoring | npj Flexible Electronics
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