Before taking measurements, please rest for at least 15 minutes and maintain a relaxed and quiet state. 1. Insert your left arm into the cuff, with the cuff air duct facing towards the inside of your palm. 2. When wearing (left hand), the triangular mark should be in the middle of the arm, at a distance of 10mm to 20mm from the elbow, and the mark of the air pipe should be on the extension line of the middle finger. When wrapping the cuff around the right arm, place the cuff air duct on the inner side of the body, and be careful not to press the elbow against the air duct. 3. When measuring, keep your body straight and relaxed, remain quiet, do not move your body, and do not speak.