Blood pressure (BP) is the pressure of circulating blood on the walls of blood vessels. Used without further specification, "blood pressure" usually refers to the pressure in large arteries of the systemic circulation. Blood pressure is usually expressed in terms of the systolic pressure (maximum during one heart beat) over diastolic pressure (minimum in between two heart beats) and is measured in millimeters of mercury (mmHg), above the surrounding atmospheric pressure (considered to be zero for convenience).
Blood pressure is one of the vital signs, along with respiratory rate, heart rate, oxygen saturation, and body temperature. Normal resting blood pressure in an adult is approximately 120 millimetres of mercury (16 kPa) systolic, and 80 millimetres of mercury (11 kPa) diastolic, abbreviated "120/80 mmHg".
For a home user you would be interested in Microlife blood pressure monitors that are not only accurate but also user-friendly. Wrist devices can be the quickest and most user-friendly of all the different types. They are smaller than the cuff model and are fully automatic. There are several wrist devices available depending on what you are looking for.
There are two types of electronic blood pressure monitors that take readings based on different methodologies. The better known of the two is the traditional upper arm cuff blood pressure monitor. When blood pressure is measured around the upper arm, a reading comes from the brachial artery. The second type of home blood pressure monitor is the wrist model. Wrist blood pressure monitors use the smaller and narrower wrist arteries to get a blood pressure reading. Make sure that the home blood pressure monitor you choose has been listed as 'clinically validated' for accuracy by the British Hypertension Society.
I would also suggest taking your blood pressure monitor with you when you go in for your next check up. By checking your BP monitor against a professional blood pressure reading, you can find out if you're getting accurate results and make sure your blood pressure machine is working correctly.