Explanation

Blood pressure is measured manually with a sphygmomanometer — an inflatable cuff plus a manometer, used with a stethoscope to detect the Korotkoff sounds. A centrifuge separates mixtures by spinning, electrophoresis separates biomolecules in an electric field, and a thermal cycler amplifies DNA — none measures blood pressure. Digital variants automate the process, but the manual cuff instrument remains the clinical standard.