Four questions. Five answers. Which one doesn't belong?

The five answers

Caliper
Compass
Level
Protractor
Ruler

The questions

Which tool can measure the internal or external diameter of an object with high precision?
Which tool is commonly used to measure the angle between two lines?
Which tool is used to determine whether a surface is perfectly horizontal or vertical?
Which tool is traditionally used to draw circles or arcs with a fixed radius?

Reveal the answers

Caliper
Protractor
Level
Compass

The False Five: Ruler

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