I've used my old blueprint dividers They were expensive, and I am glad to still use them.
Jul 26, '11
I bought mine on ebay, but there is a cheaper way. You can use a alcholol prep pad to do the same thing, just use the edge of the pad as one point and make a mark with pen or pencil on it for the other point. I keep plenty on me while on the floor. Quick, cheap, and easy!