The Most Pervasive Problems in hand counter clicker
http://manuelwqdh766.bravesites.com/entries/general/how-technology-is-changing-how-we-treat-foam-kickboard
Love it. Bought it to use for row counter for knitting. Well made in a metal housing. It is easy to reset to zero with a simple twist of the knob. Regular knitting counters do not configure to zero so easily.