Operates at a frequency of 50 to 60Hz, equivalent to that of the mains power supply, and is supplied with one roll of ticker tape and a pack of 100 Carbon Discs. It will give good results if operated from a 6-12V AC power supply. Higher voltage causes the tape to be subject to a greater drag. This device uses an electromagnet which activates a striker, producing dots via a carbon disk on the ticker tape. With 4mm terminal sockets. The Ticker Tape Timer is used in the measurement of velocity, acceleration and general timing.