You should always make sure you use the cuff size most appropriate for your arm when using a blood pressure monitor. Cuff fits arm circumference 22-44 cm. With a Long-lasting hook and loop fastener that is tested for up to 30,000 uses.
Extra Large Cuff for Arm Blood Pressure Monitor Replacement Cuff Size 22-52cm
Extra Large Cuff for Arm Blood Pressure Monitor Replacement Cuff Size S M L XL
Large Cuff for Arm Blood Pressure Monitor Replacement Cuff Size 22-48cm UK