The UltraTest Combination Measuring Set brings you the power of a square, ruler, protractor and centering gage in one convenient design. The three measuring heads attach to the 12” satin chrome blade for taking a variety of measurements with ease. The Square Head provides 45 and 90 degree angles and also features a level and hardened scriber. The reversible Protractor Head measures odd angles with precision accuracy, and the Centering Head allows you to find the middle of round stock.