Sphygmomanometers are tools that the doctor uses to check how fast your heart is beating and how hard your blood is pushing against the walls of your blood vessels.
Sphygmomanometers are important for doctors to help them understand how healthy you are.
Examples:
The nurse uses a sphygmomanometer to check my blood pressure.
The doctor has a sphygmomanometer in his office.
I don't like the feeling of the sphygmomanometer on my arm.
The sphygmomanometer makes a funny noise.
The sphygmomanometer looks like a big rubber snake squeezing my arm.
The sphygmomanometer is like a hug for my arm.