- Accurate and fast adjustment of compass tool
- scale with special sings for center and corner of the paper
- secondary lock with free movement
- protractor together with angle scale
- movement guiding rail for ruler monotonous movement
- locking mechanism as a push button for moving and fixing the ruler
- 150-degree of rotational range
- automatic lock on each 15 degrees
- see-through window for angle adjustment
- manual locker leverage
- locker bolt on desired angles
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