Arm sphygmomanometers are better than wrist sphygmomanometers and will measure more accurately.
Measurement of blood pressure instruments are more, different instruments will have different methods of operation, arm sphygmomanometer is to measure the brachial artery sphygmomanometer, when the blood from the heart shot, to the periphery of the flow of potential energy attenuation, speed, pressure with the flow of the process of reducing the periphery of the more the blood pressure attenuation of the periphery the more pronounced, when measured by the arm of the blood pressure, the measurement results will be more accurate.
Wrist sphygmomanometer mainly measures the radial artery, more suitable for emergency departments, wearing thicker in winter, the occurrence of acute symptoms undressing too late to measure the radial artery is more convenient, although not as accurate as the measurement of the brachial artery, but you can get a general understanding of the current blood pressure situation.
If you have the conditions, try to choose the arm-type sphygmomanometer, arm-type sphygmomanometer measured blood pressure value is more accurate, wrist-type sphygmomanometer error is slightly larger.