The HT1-XS Hot Tack Tester measures the strength of the heat seal in vertical form-fill-seal applications. This creates a hot tack index which is the optimum heat-seal strength over a range of temperatures. Because product is dropped into a bag from a significant height in the form-fill-seal process, there is a possibility of the bottom seal peeling open if the optimum heat-sealing parameters are not met. Consistently achieving the correct temperature range positively affects both heat-seal strength and equipment operating speed. The HT-1XS Hot Tack Tester allows the user to change the temperature and record results from multiple readings on the same graph. This reporting system follows the guidelines established in a recently published ASTM F-1921-98 standard. A touch screen display allows the user to enter set up parameters and see results more easily.