Gripmaster

Anyone whose job or hobbies require lots of work with the fingers could appreciate this item: the Gripmaster is a finger-exerciser that fits neatly in the palm of your hand and lets you exercise each finger independently, keeping your muscles strong and your joints limber. Anyone who types a lot, plays guitar, or suffers from arthritis will feel a lot better after using one of these regularly. Available in various different tensions for all strengths. $8.95 USD. (Via Cool Tools.)