All these measures are valid for the standard paper speed of 25 mm/Sec
1 small box = 1mm = 0.04 sec = 40 miliseconds
5 small boxes = 1 big box = 5mm = 0.2 sec = 200 miliseconds
Standard 12 lead<unk> duration = 10 seconds
ECG 
Cardiac enzymes
Cardiac ultrasound
D-dimer
Transcutaneous pacing
Defibrillation
Pulmonary artery catheter
IVC ultrasound