Eisco's finest dynamometer offers all metal parts encased in a premium acrylic tube. It's high clarity and internal red cylinder make for easy and accurate measurements with each use. Because the springs are enclosed they will not tangle or lose functionality. You can zero this item with a simple twist of the knob. Internal printing of scales prevents the wearing that other spring scales experience over time. Capacity - 0.1N / 10g Resolution/Sub-division - 0.002N/0.2g