Abstract: A measuring tool device comprises a horizontal module including a depressed surface, an upper semicircular hollow, and a lower semicircular body; an upper cover module including a calibrated line at its periphery; and an accessory module in a semicircular protruded form and coupled between the horizontal module and the upper cover module. The accessory module is at the depressed surface, and the upper cover module is latched to the horizontal module by a latch. The accessory module is rotated and the indicating arrows on both ends of the straight edge correspond to a calibrated line at the periphery of the upper cover module. The straight edge of the body of the horizontal module is used as a starting edge, and the straight edge of the accessory module is used as an ending edge for measuring or drawing an included angle.

Abstract: A measuring tool device comprises a horizontal module including a depressed surface, an upper semicircular hollow, and a lower semicircular body; an upper cover module including a calibrated line at its periphery; and an accessory module in a semicircular protruded form and coupled between the horizontal module and the upper cover module. The accessory module is at the depressed surface, and the upper cover module is latched to the horizontal module by a latch. The accessory module is rotated and the indicating arrows on both ends of the straight edge correspond to a calibrated line at the periphery of the upper cover module. The straight edge of the body of the horizontal module is used as a starting edge, and the straight edge of the accessory module is used as an ending edge for measuring or drawing an included angle.