There are significant differences between arm and wrist blood pressure monitors in terms of measurement principles, accuracy, usage methods, and applicable populations.

Measurement principle and accuracy
The arm type blood pressure monitor measures the blood pressure of the brachial artery in the upper arm, which has thicker blood vessels and is closer to the heart. Therefore, the measurement results are closer to the actual pressure of the heart and have higher accuracy. It is recommended as the first choice in international hypertension guidelines. The wrist type blood pressure monitor measures the blood pressure of the radial artery in the wrist. Due to the thinner blood vessels and distance from the heart, the measurement results are usually 10-20 millimeters of mercury lower than those of the arm type, which is easily affected by factors such as posture and temperature.

Instructions for use
The arm type blood pressure monitor requires the cuff to be fixed on the upper arm, and the cuff should be kept level with the heart during measurement. The operation is relatively complex but easier to standardize. The wrist blood pressure monitor only requires the cuff to be worn on the wrist for one click measurement, with high portability. However, it is necessary to strictly maintain the wrist and heart level, otherwise the error will be significant

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Applicable Population
Arm type blood pressure monitor: suitable for hypertensive patients, elderly people and other populations who require strict monitoring of blood pressure, as well as clinical treatment use.
Wrist blood pressure monitor: suitable for daily monitoring of healthy individuals, those with limited mobility, or temporary use outside, but attention should be paid to correct posture
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summary
If pursuing precise monitoring (such as hypertension management), it is recommended to choose an arm type blood pressure monitor; If portability is emphasized, wrist blood pressure monitors can be used as backup, but standardized operation is required to reduce errors.