QHQ-A New 3 In 1 pencil hardness tester small film coating hardness detection instrument paint hardness tester

Usage method 1,Place the instrument on the test piece (if the test piece is smaller than that of the instrument), place the test piece in front of the instrument and place the gasket under the front end of the instrument). 2,A pencil with a blade, the protruding part is about the lead2-5mmAnd, in the sand down the pencil is inserted into the instrument, so that the lead and test pieces after contact and fixed lock (recommended: pencil is hexagonal, choose a fixed plane,After testing, rotate two planes and then fix the test, and then rotate the two plane fixed test, a circular surface can be used(three) the gasket should be removed during the test. 3,With the thumb and middle finger caught in the center of the two wheels. Push the instrument about 1 from the rear-2cm can remove the instrument (push the instrument without any pressure).Try to see a piece of distinguishing hardness, no scratches. It is suggested that the sample should be done at least three positions, and the average value should be taken. Hardness series,Standard pencil from soft to hard 6B 5B 4B 3B 2B B HB H 2H 3H 4H 5H 6H (13 branch）.