Velleman multifunction up down counter kit velleman k8035 this project kit from velleman contains everything required to build a multifunction up down counter when assembled the counter is a very practical unit that is ideal for a range of applications such as piece part counting scorekeeping crowd tallying counting input is either by on board push button or via external pulse input and the unit will count either up or down readout of count is via four 7 segment led displays and the unit