Usage:

1. Loosen the screw and pull out the V-shaped block to rotate along the guide rail on the base to find the target angle.

2. Using the Vernier principle reading, the main scale is 1 °, and the Vernier scale is 10'.

The alignment of the "0" line on the cursor with the "0" line on the main scale indicates that the A measuring plane is parallel to the datum plane and the B datum plane is perpendicular to the datum plane.

① When the Vernier "0" line is to the right of the main scale "0" line, the degree is read by the Vernier "0" line, and the score is read out by the scale to the right of the Vernier "0" line (the reading method is the same as the Vernier caliper). The degrees (°) and minutes (') indicate the counterclockwise rotation angle of An and B measuring surface.

② When the Vernier "0" line is to the left of the main scale "0" line, the degree is still read with the Vernier "0" line and the score is read with the scale to the left of the Vernier "0" line. The degrees (°) and minutes (') read out indicate the angle of clockwise rotation of An and B measuring faces.

③ Tighten the V-shaped block to the base after adjusting the angle to the target value.