SE-12 Series Electrocardiograph User Manual Operation Preparations
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3.3.1 Electrode Placement (for Resting ECG)
The electrodes' positions on the body surface are shown in the following tables and figures.
Standard 12-Lead Placement
Fourth intercostal space at the right border of the sternum
Fourth intercostal space at the left border of the sternum
Fifth rib between C2 and C4
Fifth intercostal space on the left midclavicular line
Left anterior axillary line at the horizontal level of C4
Left midaxillary line at the horizontal level of C4