The correct use of blood pressure instruments is slightly different depending on the instrument used. 1. Mercury sphygmomanometer: Before checking, you should make sure that the mercury column of the sphygmomanometer is at the 0 point, and the 0 point of the sphygmomanometer is at the same level with the heart. The center of the cuff is located on the surface of the brachial artery, and the stethoscope is placed at the pulsation place and then inflated and auscultated, and the blood pressure value is read out according to the result of auscultation. The blood pressure should be measured again after an interval of 1~2 minutes. 2. Electronic sphygmomanometer: Adjust the cuff elasticity moderately, the position is generally more than 2/3 of the upper arm, the lower edge of the cuff in the elbow two centimeters. Generally need to measure blood pressure three times, take the average of these values. The use of blood pressure equipment for blood pressure measurement should be standardized use, need to be measured twice, such as two blood pressure measurement results are significantly different, can be measured several times blood pressure to ensure the accuracy of blood pressure.