I don't know how I managed without this magic card. I keep it in my wallet at all times, and it has saved me so much money! Without it, I made a lot of impulse buys using "guess-timates". Now I just pull out my card and check the size of unmarked beads, quickly see how many I'll need, can check the gauge of unmarked wire, and simply *measure* items (in inches and millimeters/centimeters).
I would love to give the Bead Oracle ten stars. I can't recommend this item enough.