Blood pressure instrument records

Name the modern instrument used to record blood pressure.

Blood pressure is measured by an instrument called _______.

Blood pressure is measured by the instrument called_______.

Arun went to the doctor for normal checkup. During the checkup the doctor took his blood pressure. Name the instrument of describe it.

The traffic police recorded the speed (in km/hr ) of 10 motorists as 47,53,49,60,3942,55,57,52,48. Later on an error in recording instrument was found.Find the correct overage speed of the motorists if the instrument recorded 5km/hr less in each case.