That depends on if you are saying labor contractions which is a scale of one to ten. The measurements is determined by calibrating the opening of the cervix in centimeters.
If you are talking about measuring hand grip strength there are hand calipers for that.
Any muscle can contract including the heart. An EEG can measure the heart.
Lots of answers and devices actually
dependant on each other
is it multiple choice if so what are the choices
The answer is endurance :)