The IEC 6-12V. AC Recording Timer has been used in schools for many years. It seems to be almost. The heavy diecast base with the rubber feet allows the device to vibrate at 50Hz without the need to clamp it to the bench. The stem from the base permits it to be held on a retort stand for 'falling' experiments. As with other IEC items, this has been exactly copied overseas. The kit is complete with a 30m roll of white paper and a set of 25 carbon discs for marking the dots on the paper. Large 180m long x 16mm wide paper rolls (PA2670-006) are available together with packs of 100x carbon discs (PA2670-008).