P-wave no bigger than two small boxes
Q-wave. a flat line or a downward spike no bigger than 2 small boxes
R-wave - should not be bigger than 2 big boxes (if bigger its abnormal)
S-wave-should be no bigger than 3 small boxes
Twave- no more than 2 small boxes height - and one small box wide
width shows how long it takes to recharge.
the higher the box the more intense the movement is