What is the Paper Speed of the Kardia EKGs recorded with Kardia devices? Updated January 28, 2021 19:35 The paper speed is 25 mm/s. Related articles What is the Gain of the EKG display in Kardia apps? Can Kardia Mobile record my QT interval? What is the Maximum Heart Rate of a Kardia EKG? What is the Mains Filter? What does it mean if my EKG is Unclassified?