This document discusses several tools used for angular measurement in engineering metrology. A simple protractor can measure angles with a least count of 1 or 0.5 degrees but has limited usage. A universal bevel protractor adds a main scale, Vernier scale, and rotatable blade, making it more versatile. Other tools mentioned include a sine bar, angle block gauge, spirit level, clinometer, autoclinometer, and angle dekkor.

1. Angular Measurement

2. Protractor
• A simple Protractor is the basic device for
measuring angles. At best, it can provide least
count of one degree for smaller protractor and
half degree for large protractors.
• Like a steel rule, the simple protractor has
limited usage in engineering metrology. But, a
few additions and a simple mechanism, which
can hold a main scale, a Vernier scale and a
rotatable blade, can make it very versatile.

3. Universal bevel protractor

7. Sine bar

11. Angle Block Gauge

12. Spirit level

13. Clinometer

14. Autoclinometer

15. Angle dekkor