RPG, Wargaming counter tool

 I use dice as markers quite often to keep track of HP, but what to do when the numbers I'm tracking get higher than the die pips? I toyed with making small wooden slide counters with limited success, but then I located these Knitting counters.

I placed a standard six sided die by them to show the size.  They are hollow, and slide onto knitting needles and I think you click them to keep track of the pattern or something ( I have no clue about knitting). 

They are made of plastic, don't really click sharply into place but will hold the position you rotate them to. With two adjustable columns they can track from 01 to 00 or one to one hundred. A pack of 10, five of each size was about $7.00 if I recall. 

I have primered and painted them and they still function well. For under $10.00 I think this is an excellent buy and a handy thing to have for wargaming.