01
Check the Cuff Size
The cuff must fit your upper arm correctly. A cuff that is too loose or too tight can affect the measurement. Measure your upper-arm circumference before choosing a pressure machine.
The OMRON HEM-7140T and HEM-7121 include a 22-32 cm arm cuff. Cuff size is not clearly stated on every current product page. Confirm the supported size before ordering if your arm is outside this range.