The Cobb semi-automatic instrument is used to determine the liquid permeability of paper and board which is very important in packaging papers, although this test is used in many types of papers. The instrument includes a cylinder, roller, and the stopwatch in a compact solution. This Unger based system can be used with water and oils. It has the advantage of making the testing process easier and more accurate. The built-in stopwatch starts at the beginning of the test and notifies the operator 15 seconds before the end. Ideal equipment for laboratories where many tests are carried out continuously.