question about "drawing compasses"

There was a question about "drawing compasses".

Having a good one is going to make your class much more enjoyable.

Best thing is to have a couple, one like this:

http://www.officedepot.com/a/products/448841/GeoMaster-Bow-Compass/

or like this http://www.draftingsteals.com/21111.html

and one like this:

http://www.draftingsteals.com/20013.html

You want to have one to change the colors and another one just to make marks, if possible.

I bought mine in LA at office depot or similar.

See you soon in Barcelona.

Love

Ferran