Rub Proofness Tester, measures how effectively printing ink adheres to paper or board. Conforming to BS 3110, the instrument evaluates the extent of colour transfer from printed or coated materials due to rubbing - a condition which frequently, Linux Rub Proofness Tester measures the resistance to rubbing of printed paper or board. It can also be used to measure colour transfer from printed or coated material during rubbing.