Now that summer's officially upon us, it's likely that some of our geek ranks will actually venture outside. Protect your pasty pallor from scorching with Oregon Scientific's Personal UV Monitor. The built-in sensor calculates your recommended exposure time based on detected UV level, skin type, and SPF of your sunblock. Splash-proof construction makes it safe to use poolside and at the beach. Slightly bigger than a credit card and less than an inch thick, the device is easy to bring along in any bag, but also includes a wrist strap for those less-encumbered types (read: guys). At only $29.95, the only way protecting your skin could be any less foolproof is if you stayed inside.