Keyboards, guitars, golf, and moreThis week's roundup shows off the versatility of your iOS hardware\u2014for use in writing, making music, playing sports, and a whole range of life's activities. Read on.Blast MotionThe $150 Blast Golf system attaches a sensor to your golf club; fire up the app on your iOS device, and record your swing. The video view, combined with data transmitted from the sensor via Bluetooth, will tell you everything you need to know to become the next Sam Snead. And it\u2019s social: Share your stats via Facebook, Twitter, and e-mail from the app.Clam CaseOne of our favorite keyboard cases for the iPad is now available for the iPad Air 2. The $169 ClamCase Pro makes your tablet look, feel, and be usable as a fully functional laptop. It has a 360-degree hinge so you can use the tablet in a stand, or fold up for use simply in tablet form. The lithium battery allows you to use the Bluetooth keyboard for more than a month between charges. \u00a0DropThe $100 Drop is an iPad-connected kitchen scale that helps you measure out your ingredients precisely, so that you can bake great pies, cakes, breads and more every time you use it. Nom.LogitechThe $70 Key-to-go portable Bluetooth keyboard is handy, but its chief attribute might be durability: It has a FabricSkin cover, making it spill-resistant, as well as easy to store in your bag on the go.PhotojojoThe $27 Gee-Whiz Smartphone Projector is one of the more fun accessories we\u2019ve seen recently: \u201cYou assemble it yourself! Pop together the cardboard pieces and magnifying lens for a simple, nostalgic, and power-free projector. Your phone's images will be magnified 8x bigger on your wall, the ceiling or your boyfriend's cat!\u201dPowerSkinThe $50 PoP\u2019n 3 is the latest in this line of PowerSkin batteries. The 4000-mAh battery suctions onto the back of your iPhone and extends the phone\u2019s life by 150 percent. The makers say: \u201cYou can pop it on when you want, and pop it off when you\u2019re done.\u201dSeek ThermalThe $299 Seek Thermal XR attaches to your iPhone and lets you see hot spots, \u201cmaking it possible to spot people and animals in daylight, total darkness, or in obscured visibility conditions.\u201d Good for hunting, boating, security, electrical inspections and more.ZivixThe $300 Jamstik+ is a \u201csmart guitar\u201d that can connect to your iOS device via Bluetooth\u2014it\u2019s useful as a learning guitar, but it also has an improved magnetic pickup to make the instrument more satisfying to experienced players.