1. Install the 2N, 3N, 7N, 10N, and 15N scratch pins and 1.0 mm diameter balls under the fingers. 2. Check the loading forces, measured directly at the scratch pin by using spring balance. 3. Place the sample under the five scratch fingers and push them one time from right to left across the sample at the rate of approximately 100 mm per second, length of scratch lines 200 mm.4. Mark the direction of outlined movement by labeling the load at the beginning of the test line.