(1) Measure the Angle between 0° and 50°
The measuring part of the product is placed between the measuring surface of the base ruler and the ruler for the measurement.
(2) Measure the Angle between 50°-140°
The right square can be removed, installed on the ruler so that it is connected with the sector plate, the measured part of the work is placed between the measuring surface of the base ruler and the ruler, and the right square can not be removed, only the ruler and the clamp is removed, and then the right square is pulled to the bottom until the intersection of the short side and the long side of the right square and the sharp edge of the base ruler to its. The measured part of the workpiece is placed between the measuring surface of the base ruler and the short edge of the right square for measurement.
(3) Measure the Angle between 140° – 230°
Remove the ruler and clamp, and install only the right square, but push the right square up until the intersection of the short and long sides of the right square is aligned with the sharp edge of the base ruler. Place the measured part of the work between the measuring surface of the base ruler and the short side of the right square for measurement.
(4) Measure the Angle between 230° and 320°
Remove all the right squares and clamps, leaving only the sector plate and the main ruler (with the base ruler). Place the measured part of the product between the base ruler and the measuring surface of the sector plate for measurement.