you the lead is a folding ruler pencil an angle for an angle ruler a circular saw and it's all tied in a couple of I'm not forgetting my angles from the days of myself and I can create minimum amount of weight and I know that I have one full scale reference then I measure the distance from the saw blade on the server so do we allow the shoes and then I take this measurement which is in this case three and a half centimeters and a measure three and a half centimeters from the line I just drew and inward so that I have a solid reference for my so life you detective the chemistry I place my ruler over the comparative comfort and you'll see it straight if there is no gap between material and Rubin so then it's given the old fear so I can use using dust plate as a reference for the next truck you