When a standard sheet test, the vertical direction and the horizontal grain. Prior to the test sample, at least a month in the standard test piece to verify the instrument to ensure that the instrument is properly calibrated.
When testing, the grain direction is perpendicular to the horizontal level. Before the sample test, test the standard plate on the instrument at least once a month to verify that the instrument is properly calibrated.
When the standard sheet is tested, the grain direction is vertical to the horizontal. Before the sample test, test the standard piece on the instrument at least monthly to verify that the instrument is correctly calibrated.