This timer works like a clock and produces precisely sixty dots per second on a moving strip of paper.
Calculate acceleration, drag, and friction by measuring the interval between dots. The unit is heavy enough to rest on the edge of a table without clamps and is also designed to clamp to an upright support rod or crossbar.
Ordering information: Carbon discs, a 5' 10" cord with on/off switch, and instructions are included. Tape is required and sold seperately. Not available in Canada.