Review on SYWAN Precision Mechanical Protractor Woodworking by Deon Sweeney

Easy to read and very accurate, but the top T-bar is too short for such a long T-square. When trying to draw lines in the 150-300mm range, the short top makes it difficult to keep the T-square square as you move it across the material. I just drew some wavy lines on a piece of paper. Aluminum, that should have been straight. I wouldn't have a problem if the top bar was longer.