Callipers

Question 1

What is an internal caliper?

Answer 1

An instrument for measuring the internal width of a gap. Two metal pins are extended to touch the edges and the measurement is taken.

Question 2

What is an external calliper?

Answer 2

An instrument used for measuring the width of an object. A metal arm can be slid along the body to touch the edges of the item and a measurement can be taken.

Question 3

Disadvantages of an internal calliper?

Answer 3

Parallax error
Angle could be wrong
Arms are small so can only measure singular area.