TIMER ACCELERATION 2 SPEEDS ,Each

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Here is the corrected text: Eisco Labs Ticker Timer with 12V Power Supply (110V Plug) This ticker timer operates at a rate of 25 or 40 dots per second and runs on a 12V DC supply, which is included. The package includes a 50m tape roll and 100 carbon discs. This comprehensive kit has everything you need to get started, including a wall plug adapter, so no additional power supply is required. This timer is a tried-and-true method for students to visualize distance, velocity, and acceleration versus time. For example, attaching it to an inclined cart on a ramp allows visualization of gravity's acceleration, as seen by the spacing between dots on the tape. The vibrating striker prints dots on the tape using carbon discs at a selectable rate of 25 or 40 dots per second, depending on your selection. The unit is housed in a durable, scratch-proof, and shock-absorbing plastic case with a unique method for adjusting the position of the carbon disc. Additional accessories include an extra paper tape roll (PH0353B), which comes with 100 carbon discs and one 50m roll of tape. The timer operates on 12 volts, and the adapter is included.