Weight:15 pounds (6.8 kilograms)
As for the price I could have vastly inflated the price of a compass to an inaccessible value that prevented anyone from playing with it until later in the game when even dragons fear their approach, but by that time what need would they have for such a kit? In the end I elected to put it at a price that was expensive but not to such an extent that it would penalize anyone who wanted to pick it up as part of their character's equipment. If you feel that the price is too low than I suggest increasing it by a factor of ten as it will still see some use.
Hulme, Frederick Edward. Mathematical Drawings, Instruments, and How to Use Them. London. Trubner & Co., 1879. Digital Scan. pg. 93