Print the circle grids on clear plastic. A 5 Mill thick transparency sheet works great. Shrink plastic sheet for ink jet printers works as well. However, if it gets wet, the ink will run and the plastic will become cloudy. If the printed piece is used carefully, this should not be a problem. Just as easy: Go to your local office supply store and have them print a plastic copy.
Pro Tip: My proof reader, Carol Erickson, says to cover the print with clear contact paper so the print will not rub off. It can be put on both sides of shrink plastic to avoid the moisture problem-SMART!