Vernier protractor

The utility model discloses a vernier protractor which is a measuring tool which can be used for accurately measuring angles and radians. An ordinary protractor can only be used for accurately measuring to the bit of 'a degree '. The utility model is mainly composed of two parts of an angular measurement scale disk and a vernier. The vernier is made into a fan shape and the radius of the vernier is slightly smaller than the radius of the scale position of the angular measurement scale disk. The center of a circle of the vernier is superposed with the center of a circle of the angular measurement scale disk. A thin shaft is penetrated through each center of a circle and is sued for fixing the vernier and the angular measurement scale disk. The vernier can be appressed with the plane of the angular measurement scale disk and is rotated around a fixed shaft. The working principle of the vernier is used for accurately measuring to the bit of 'a fractile'. The utility model has the advantages of simple manufacturing process, convenient use and wide use and is an advanced tool for study and measurement.