Based on the classic design, the ProTear Testers quickly and accurately measure the tear resistance of sheet materials including paper, textiles, roofing products, film and foils.The ProTear Tester offers several capacity configurations ranging from 200 to 25,600 grams. Capacities can be changed quickly and easily with augmenting weights. This configuration eliminates the necessity of multiple pendulums and simplifies the testing of different material.The electronic model provides several enhancements over the mechanical model. All test results and statistics are calculated automatically and displayed on the built- in screen. An RS-232 port enables test results to be transmitted to a printer or computer. Other standard features of the electronic model include air-actuated pendulum release and sample clamps, microcomputer-assisted pendulum balancing and a membrane switch display panel. The control panel provides one-touch clamping and test capabilities. Other functions include data entry of sample information such as sample ID, thickness, basis weight, sample direction and number of plies being torn. The “Units” key enables the simple conﬁ guration of result units.