The stanley fat max pro level has solid block acrylic vials to provide an accuracy of 05mmm in eight orientations in addition every fat max pro level comes with a lifetime accuracy warranty the level is 5 times stronger than other stanley levels thanks to its unique reinforced box beam construction the lightweight aluminium body and sturdy bi material handgrips make handling easy and the precision engineered dual machined levelling surfaces ensure maximum accuracy the vials are magnified by 20 f