Belkin's TrueClear InvisiGlass Screen Protector for iPhone 5 ($40) is ever so slightly thinner than Spigen SGP's GLAS.tR Nano Slim -- 0.2mm versus 0.23mm -- but it's so thin that it looks and feels like a slightly rigid plastic sticker. Otherwise, it's very similar to the handful of self-adhesive glass screen protectors we've seen in the past. Once you've cleaned your screen with the included cloth and dust-removal film, it sticks to the display,…
