The Cobb Absorption Tester is a routine testing instrument designed and manufactured in accordance with the GB/T 1540-2002 standard (Paper and board — Determination of water absorption — Cobb method), also known as a paper surface absorption gravimetric tester. The instrument uses the Cobb test method to determine the surface water absorbency of various types of paper or paperboard. The entire apparatus is constructed from 304 stainless steel for exceptional durability and rust resistance. A water level line is set inside the water reservoir for convenient observation of water volume. The metal cylinder has an internal cross-sectional area of 100±0.2 cm² (corresponding inner diameter of 112.8±0.2 mm) and a height of 50 mm. A smooth metal roller is provided with a width of 200±0.5 mm and a mass of 10±0.5 kg. The blotting paper has a grammage of 200-250 g/m² and an absorption rate of 75 mm/10min. Overall dimensions are 390×280×410 mm with a weight of 20 kg. This instrument is a standard configuration device for testing the surface water absorption properties of paper and board in paper mills, quality inspection agencies, and research institutions.