Welch Allyn CP 50 Plus 12-lead resting electrocardiograph - User Manual - Manual (Page 27)

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)
R
(green)
Just above the left ankle.
Directions for use ECG tests 23