Combined angle scale

The utility model relates to a pipeline is the instrument for the constructional survey, in particular to combined angle scale. The device includes benchmark mechanism, benchmark mechanism is by the left side, the higher authority, the right, a part of parallelogram of constituteing of pin junction in order on the long limit of square, the semi -circular protractor of the inboard connection in the long limit of square, the centre of a circle department that limit pin junction department is located semi -circular protractor is grown with the square in the left side, use the centre of a circle as the centre of a circle on the semi -circular protractor, 52.5mm for the radius division semi -circular empty fixed button rotation dead slot that is, the fixed button of benchmark mechanism is connected on the left side, the fixed button of benchmark mechanism can remove and drive the left side and remove in the rotatory dead slot of fixed button. The utility model discloses a can direct measurement, the arbitrary angle of branch pipe of control valve wire pair mouth straightness accuracy, flange mounting perpendicularity and piping, improve the installation quality of pipeline, flange, pipe fitting etc. Avoid leaking, reduce pipeline safety risk.