Dealing with Sphygmomanometer

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 A sphygmomanometer or blood pressure meter (also referred to as a sphygmometer) is a device used to measure blood pressure, composed of an inflatable cuff to restrict blood flow, and a mercury or mechanical manometer to measure the pressure. It is always used in conjunction with a means to determine at what pressure blood flow is just starting, and at what pressure it is unimpeded. Manual sphygmomanometers are used in conjunction with a stethoscope.

 http://en.wikipedia.org/wiki/Sphygmomanometer

When using the sphygmomanometer to take blood pressure, do not pressurize the cuff higher than 150 mm Hg. Allow two minutes to pass before re-inflating the cuff when taking repeat blood pressure measurements on the same individual. This experiment can cause stress leading to a shock reaction and unconsciousness. 

http://mdk12.org/instruction/curriculum/science/safety/hazards.html