A digital device for measuring blood pressure from the upper arm. Measurement Accuracy: These devices typically provide a blood pressure measurement accuracy within \(\pm 3\) mmHg and a pulse accuracy within \(\pm 5\%\). Features: They often include large backlit LED displays, memory for storing readings for different users, and indicators for detecting irregular heartbeats. Operation Method: Most operate fully automatically with a single button press after placing the cuff on the arm.