<a data-hook="product-link-linked" class="a-link-normal" href="/Starrett-C33H-12-4R-12-Inch-Combination-Square-with-Square-Head-Only/dp/B00002254K/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Starrett C33H-12-4R 12-Inch Combination Square with Square Head Only</a>&nbsp;One spends this much money for a square to get accuracy. Starrett is world renowned for accuracy in their tools. However, the first unit shipped by Amazon was not square when checked against 3 different machinist's squares. Amazon promptly replaced the first unit and the 2nd model is square as expected. Thanks, Amazon.