HIGH-PRECISION PRECISION - Digital angle measure accuracy: 0.05 at 0~1 or 89~90 , 0.2 at 1 ~89 . Bubble accuracy: 0.029 horizontal and vertical. Displays angle and bevel readings in degrees, pitch IN/FT, mm/M, and percent slope. Great for roofs, rails, ADA ramps EASY To USE & PACKED With FEATURES - 24 leveler s longer length makes it ideal for leveling across several pictures, putting up wider shelves, installing cabinets and lots of other DIY projects around the house. The high-contrast blue vials are highly accurate and easy to see. The digital LCD screen is backlit, so you can read it from any perspective, and adjusts to the correct orientation however you hold it.