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The description of function and possibility：For students,Protractor is an essential tool which is used to drawing and measuring angle,however,when we draw angle,we need to mark down a dot firstly in order to draw the angle properly,and secondly,we should connect the basic dot to another dot which we have marked by ruler.Maybe for most of students,this is very verbose and inefficiency.ROID protractor has a semicircular groove and simple shaft device,they can improve the needle to slide from 0°to 180°,so this kind of protractor is very convenient and accurate for user who need to draw angle than usual protractor.