Super accurate. Solid-block acrylic vials provide the best-in-class accuracy of 0.5mm/m in eight orientations. Plus every FatMax XL level comes with a lifetime accuracy warranty. 5 x stronger than other Stanley levels thanks to its unique reinforced box-beam construction. Light, tough and easy to handle. Lightweight aluminium body and sturdy bi-material handgrips make handling easy. Precision engineered. Dual-machined levelling surfaces for maximum accuracy. Magnified centre vial. Centre vial is 20% larger than standard, making it clearer to read. Shock absorbing ends protect the level even if its dropped. 10-year warranty. Reviews 5/5 I regularly use this level for all aspects of landscaping and builder... it has been dropped, knocked about to level paving with a rubber mallet and is still 100% accurate !! Wouldn't use anything else now, and believe me, I've killed many levels! 5/5 absolutely fab, have the 4ft and 6ft levels never had anything so strong and durable, would recommend