The device is a tablet

Over the range of special bars, made in the side walls of the box, free moves left and right line 7, worn by her ambitious slider 6, which moves up and down the line. On the left side of the slider marked centimeter and millimeter division needed to build a linear scale. Base price of the last applied in pencil. On the right side of the slider, at some distance from the edge, there are also millimeter divisions. On the case from both sides made swivel-Kohl, to which are attached straps. In the middle of one side of the box set to ring through which the tablet is attached to a belt at the waist Surveyor. The tablet closes sliding lid on the inner side of her arranged pocket for storing spare sheets of paper. In a special socket plate 2 during the march kept measuring foam (Fig. 1). The tablet can be done without the nest, which will greatly reduce its weight. In this case, pencil box is kept in its case in a side pocket of a backpack.