Calculate acceleration, drag, and friction by measuring the interval between dots.

• Mechanical timer device
• 60 Hz (mains power frequency)
• Timer size: 7L×2W×1¹/₄" H
• Tape length: 300 m per roll
• Tape width: 9 mm
• Carbon disk Ø: 38 mm

This timer works like a clock and produces precisely sixty dots per second on a moving strip of paper. 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. The timer is powered directly by 110 V AC via a 5' 10" cord with an on/off switch.