There has been some talk about adding a counter to the Star/Magma sizers lately. Some have talked mechanical counters and some electronic counters. I gave it a whole 5 minutes of thought on which way I wanted mine and came up with what I feel is an easy cost effective way of doing it. It may not appeal to everyone but it works for me. The counter is an ebay item that sells for less than $10 and a cheap $1.50 micro switch and home made bracket.
Upon the down stroke and bullet being expelled the counter counts. I can also add a switch to zero the counter and another switch to adjust the count in case I need to take away from the tally.