e250 Professional Combination Square 12-inch Heavy Duty Professional Combination Square with Etched Stainless Steel Blade and True Blue® Vial. The e250 Combination Square features a stainless steel blade and matte finish that will never rust or corrode. The True Blue® vial is guaranteed accurate to within .00050 inch and It carries a lifetime guarantee.

True Blue® Empire Level is the home of True Blue® – the most accurate vials in the world. The newly designed True Blue® series of levels and squares are engineered to provide maximum accuracy, extreme durability, and enhanced readability with the strongest warranty in the industry. Empire Level is the leading designer and innovator of accurate levels and measuring tools. The blue fluid in our level vials is Empire’s unique symbol of superior accuracy and a trademark of Empire Level Mfg. Corp.

About Empire Level
The history of Empire is synonomous with the modern level itself. Henry Ziemann, a master carpenter, founded the Empire Level Manufacturing Corporation in 1919 by inventing the first level with replaceable bubble vials. Ziemann's son Harry was responsible for developing the torpedo level. When pharmacist Donald Wright married into the business in 1953, even he probably could not have foreseen that he would continue this tradition of innovation, patenting the first permanently embedded single-bubble vial, an innovation that would forever change the way levels were built, and later introducing the magnetic level, the top-reading level, the first all-plastic level, and the grade lines on bubble levels for reading pitch angles.

Empire now holds 30 patents and claims more improvements to this simple yet essential tool than any other manufacturer.

Today Empire Level is the leading designer and producer of levels, squares, layout tools and caution tape in the United States with dominant market share in the retail, contractor supply, and "Do-It-Yourself" mar