Accurate cycle computer
Good value cycle computer from GO Outdoors
A bit tricky to set up (l found it difficult to position the sensor -2mm from the magnet on the spoke); also the cable ties seem to work loose. It would be better to have rubber spacers included so the ties grip the fork better. Cable ties on the handlebar work loose as well.
Having said that, once fixed tight (I ended up making a couple of rubber spacers) once calibrated the computer is really accurate, I tested it over a measured mile and it it spot on.