This device is suitable for testing the seal edge of peel-off packaging by peeling off the lid or sealing material of dimensionally stable or rigid packaging media, e.g. individual blister packs for contact lenses. It possesses a support block with a holding-down device and screw clamp designed to retain the film in position. During the test, up to 90 % of the lid is pulled off. The screw clamp has a maximum opening width of 2 mm and is suitable for gripping forces up to 300N.