Introduction to Metals
March 22, 2022
Optical Comparators
March 22, 2022
Marking and inspecting perpendicular and angular surfaces is critical to produce quality
products. Precision instruments called squares and protractors are used extensively to ensure
squareness and accurate angles. In this course, you will gain the mastery required to accurately
measure with squares and protractors.
By the end of this course, you will be able to
• List the parts of a solid square
• List the parts of a combination square
• Use a solid square to mark perpendicular lines
• Use a center head to find the center of a round part
• Use a combination square to measure and mark lines
• Use a protractor head to mark angular lines
Course ID Number: MEA-2014