Structure:
Instruments for mechanical three-point contact with the measured surface(two o'clock for the round, is to lead core) is always guaranteed pencil and measured surface 45 Deg angle to the horizontal force pushing the instrument movement to complete the testing process, measuring coating ability to resist deformation

How to use it:
1. Put the tester on the flat(if the test piece is smaller than the instrument, set test piece placed in front of the instrument and the gasket on the bottom front of the instrument, the purpose is to maintain the level of the instrument)
2. With a blade pencil, so refill protruding part about 2-5mm,and polished in sandpaper, the pencil into the instrument, so refill after contact with the test piece and fixed locking(recommended: pencil is six gon, select a fixed plane, after the test, a circumferential surface can be used three times) during the test to remove the gasket
3. With the thumb and middle finger to grasp the center of the two wheels, The instrument from the back to push about 1-2cm away instruments(Do not add any pressure to push the instrument).Determine the hardness, see specimen for scratches, Recommended test pieces do at least three locations or more, taking the average
Package Included:
1 x 3in1 Pencil Scratch Tester
1 x Carry box
13 x Pencil 6B-6H（6B、5B、4B、3B、2B、B、HB、H、2H、3H、4H、5H、6H）