i use
http://buy1.snapon.com/catalog/item....re&dir=catalog
and this
http://buy1.snapon.com/catalog/item....re&dir=catalog

my digi i have been using straight 3 or 4 years now. just send it off once in awhile make sure its all good. as far as warranty goes dont drop it an your fine.

my 1/2 i hardly ever use anymore. still a great tool.