What is the Gain of the EKG display in Kardia apps? Updated January 28, 2021 19:35 The gain is 10 mm/mV. Related articles What is the Mains Filter? What is the Paper Speed of the Kardia EKGs recorded with Kardia devices? Can Kardia Mobile or Kardia Band detect Arrhythmias other than AFIb? Can Kardia Mobile record my QT interval? What does it mean if my EKG is Unclassified?