If you want a portable ECG system that can record data accurately, the Kardia 12L is a good choice. This handheld AI-powered device is intended for use by trained health care professionals or staff, with a single-cable design and AI trained on more than a million ECGs to guide placement of the leads and minimize errors. It can make 35 determinations, including acute myocardial infarction and cardiac ischemia, and works with standard snap or tab electrodes.