It's tempting to merely add United SGP's Kuel H10 ($13) to the list of iPad, iPhone, and iPod touch stylus options without further comment, but despite its similarities to many other little tube styluses we've seen before, Kuel H10 is actually pretty nice. Consisting of a surprisingly substantial-feeling tube that's shorter than a full-sized pen and tipped only with a silicone rubber dome, not ink as suggested in its full product name, the stylus…