Patrick mentioned a PEC combination square. I agree they are very good. If you want to save some money, go to eBay and search on "PEC blem" and you'll find some sellers who offer the PEC blemished combination squares for very reasonable prices. I haven't bought any of the 12" PEC blems but I have bought several PEC blem double squares and they're excellent. Better than the iGauging one. Maybe better feel than the Starrett.
Mike
Go into the world and do well. But more importantly, go into the world and do good.