The Paper Tearing Tester is a specialized instrument for measuring the tearing strength of paper. Its main technical specifications and performance parameters fully comply with ISO 1974 (Paper — Determination of tearing resistance — Elmendorf method) and GB 455.1 (Determination of tearing resistance of paper) standards. The instrument has a measuring range of 10-1000 mN, with a standard pendulum of 10-1000 mN and a scale graduation of 10 mN. The indication accuracy is ±1% within the 20%-80% of the upper limit of the range, and ±0.5% FS outside this range. The indication repeatability error is ≤1% within the 20%-80% range, and ≤0.5% FS outside the range. The tearing arm is 104±1 mm, the initial tearing angle is 27.5±0.5°, and the tearing distance is 43±0.5 mm. The clamping surface dimensions are 25×15 mm, and the distance between clamps is 2.8±0.3 mm. This instrument is an ideal testing device for the papermaking, scientific research, and product quality supervision industries.