Usage: Check the anti-cracking index of leather upper and various thin objects. Fix the outside of the test piece with a clamp frame, at a speed of about 12mm per minute, so that the steel ball is pushed up from the inner surface of the leather, when the leather surface cracks, the rising height value is the crack measurement value.

Specimen diameter	48mm
Test diameter	25 mm
Ball diameter	6 mm
Scale range:	0.05 ~ 25 mm
Chi Cun:	7cm, height (H)15cm