Welch Allyn CP 150 12-lead resting electrocardiograph v.1.00.XX - User Manual - Manual (Page 25)

Electrode locations
AHA IEC Location
A V1 (red) C1 (red) Fourth intercostal space at the right sternal border.
B V2 (yellow) C2 (yellow) Fourth intercostal space at the left sternal border.
C V3 (green) C3 (green) Midway between V2 and V4.
D V4 (blue) C4 (brown) Fifth intercostal space to the left of the midclavicular line.
E V5 (orange) C5 (black) Anterior axillary line at the same horizontal level as V4.
F V6 (purple) C6 (purple) Mid-axillary line at the same horizontal level as V4 and V5.
G LA (black) L (yellow) Just above the left wrist on the inside of the arm.
H LL (red) F (green) Just above the left ankle.
I RL (green) N (black) Just above the right ankle.
J RA (white) R (red) Just above the right wrist on the inside of the arm.
Directions for use ECG tests 21