Protractor with clip

Formed of the block measurement+display on which we take up a clip which can receive most of the various types of arm ends. The device 06091-A is supplied with standard adapters which accept most of the arm ends.
The photo opposite shows the clip with the standard adapters; the left adapter is maintained against the reference ring; The right adapter is put in the position corresponding at the arm end by means of a knurl. The tightening effort on the extremity of arm is applied through a spring blade what allows the fast change of arm by sliding simply the extremity between both adapters.