| Lead | Colour | Position |
|---|---|---|
| V1 | 4th intercostal space to the right of the sternum | |
| V2 | 4th intercostal space to the left of the sternum | |
| V3 | Midway between V2 and V4 | |
| V4 | 5th intercostal space midclavicular line | |
| V5 | Preaxilla, in a straight line from V4 | |
| V6 | Midaxilla, in a straight line from V4 |