NBC-5684 Cobb absorptivity Tester's video

CHINA Cobb absorption Tester NBC-5684 metal cylinder cross-sectional area of 100 +/- 0.2cm, cylinder height 50mm, absorbent paper weight 200-250g/m2, absorption speed 75mm/min, NBC-5684 is not suitable for accurate evaluation of paper or Cardboard writing performance.