A device or instrument that records electrical activity or properties of something, producing a written record or image.
From electro- + graph (Greek, to write). This term emerged alongside electrocardiographs and electroencephalographs in early 20th-century medicine.
An electrograph can reveal the invisible—it converts electrical signals from your heart, brain, or muscles into visible squiggly lines that doctors can read like a secret code your body is sending!
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