The Paper and Board Thickness Tester is a precision laboratory instrument for measuring the thickness of flat sheet specimens, widely used for single-sheet and bulking thickness determination of paper, board, and soft tissue. It fully complies with the strict requirements of international and national standards, including ISO 534, ISO 438, GB/T 451.3, and GB/T 1938. The instrument provides two standard measuring pressures (100 kPa and 50 kPa), a measuring range of 0–18 mm, a dial indicator resolution of 0.01 mm, indication deviation of ±2.5 μm, and measurement repeatability of 2.5 μm. The measuring area is 200 mm², ensuring precise, stable, and highly comparable test results. With a compact design (80×120×120 mm) and a weight of only 2.5 kg, it is easy to use and move within the laboratory. This thickness tester is an essential basic instrument for physical property testing in paper mills, packaging and printing plants, inspection agencies, and research institutions, providing reliable data support for material thickness and density analysis.