➋ Wrap the cuff around the left upper arm, and the cuff tube should be located inside the arm and in line with the middle finger. 6 different types of connectors(4mm/0.16in, 4.6mm/0.18in, 5mm/0.2in, 6mm/0.24in, 7mm/0.28in, 11.3mm/0.445) are compatible with almost all blood pressure monitors.