ASVAB Practice

Measuring and Layout Tools

• Tape measure: Flexible steel tape for measuring length.
• Combination square: Marks and checks 90° and 45° angles; also checks for level.
• Protractor: Measures angles.
• Calipers: Measures inside dimensions, outside dimensions, and depth with precision.
• Micrometer: Measures very small dimensions (shaft diameters) to thousandths of an inch.
• Level: Centered bubble in a liquid-filled vial indicates a level (horizontal) or plumb (vertical) surface.
• Plumb bob: Weight on a string pulled by gravity to establish a perfect vertical line.
• Wire gauge: Disc with notched slots to measure the diameter (thickness) of wire.