This Thing contains all you'll need for school. From graphing to drawing geometrical shapes to helping you create that book shelf in shop class, this set has got you covered. Measure everything from distances and radii in centimeters and inches, to angles and even weights! The ruler is a combination scale, commonly used for drafting. It's got 4 scales, a 1:10 and 1:50 engineering scale, and a 1:100 and 1:500 metric scale. The good thing about these scales is that you can use the 1:10 scale as a standard uscs 6 inch ruler, and the 1:100 as a 15 cm ruler. The pencil topper includes 2 different toppers which you can combine to create a compass for drawing circles. The one I printed out works ok if you can hold everything still while you draw your circle. The other topper just attaches to the first one and spins... because reasons. The pencil case has two 30-60-90 triangles that can be used to draw straight lines and angles. In addition, the triangles serve as templates to measure and draw several metric and uscs radii. The handle is a secondary protractor/ruler and can be combined with the pencil topper to measure or draw specific angles. The handle slides onto the peg on the covers and the covers snap into the base. Thanks for reading and I hope you like it! Update: So I had this idea to use 2 of the protractors and the pencil toppers to create a balance scale. I wasn't going to make it at first, but I figured it would be easy enough to model so I went and did it anyway. The balance stands have pockets for pennies which is what you can use to determine the weight. Each penny weighs 2.5 grams. The cell phone battery shown in the picture weighed 40 grams. I also created a set of balance weights in some standard increments (http://www.thingiverse.com/thing:155875). Those were designed to work with this scale.The pencil toppers simply push together to form the compass. The triangles form the cover for the case and snap in and out. The protractor forms the handle for the case and slides over a pin on the cover. For the balance scale, I printed out an earlier version, and then beefed it up a little by doubling the pencils used. Make sure that the balance stands are equally spaced from the center of the protractor. File down the edge of the protractor so that there are no uneven spots. I printed all of these out at full scale with the exception of the case since it was too big for my printer.