also calliper
(~s)
1.
Calipers are an instrument consisting of two long, thin pieces of metal joined together at one end, and are used to measure the size of things.
N-COUNT: usu pl, also a pair of N
2.
Calipers are devices consisting of metal rods held together by straps, which are used to support a person’s legs when they cannot walk properly.
N-COUNT: usu pl