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Blood pressure measurements have been part of the basic clinical examination since the earliest days of modern medicine. The basis of any physiological measurement is the biological signal, which is first sensed and transduced or converted from one form of energy to another. Indirect measurement is often called noninvasive measurement because the body is not entered in the process. The auscultatory method most commonly employs a mercury column, an occlusive cuff, and a stethoscope. In recent years, electronic pressure and pulse monitors based on oscillometry have become popular for their simplicity of use and reliability. There is great significance for ambulatory monitoring of blood pressure. The annual publication of the Medical Device Register is a comprehensive reference work that provides a wealth of detailed information on US and international medical devices, medical device companies, OEM suppliers, and the key personnel in the industry. Most commonly used sites to make continuous observations are the brachial and radial arteries.