ايزو 12137:2011 specifies a method for determining the abrasion resistance of a single coating or the upper layer of a multi-layer system of paint, varnish or related products using a curved (annular or ring-shaped) مسبار. The test has been found to be useful in comparing the abrasion resistance of different coatings. It is useful for offering a range of coated panels that exhibit significant differences in abrasion resistance. ايزو 12137 does not specify a method for using a pointed pen; two are specified in ISO 1528-1 و ايزو 1528-2, على التوالى. The choice between the three approaches will depend on the particular practical problem.