What is the Gain of the EKG display in Kardia apps? Updated December 21, 2017 22:45 The gain is 10 mm/mV. Related articles What is the Mains Filter? What does it mean if my EKG is Unclassified? What are the AF, Normal and Interference Detectors? What phones and tablets are compatible with KardiaMobile? Can I connect my Omron Blood Pressure monitor to Kardia on my Android smart phone?