Vials accuracy of +/-0.5 mm/m allows for faster and more accurate readings Magnified centre vial for improved all round visibility 250mm (10 Inch) Aluminium lightweight die-cast body provides maximum durability Two magnets within the base offer ultimate holding power for hands-free levelling of metal or piping construction work Pipe groove provides maximum adherence to cylindrical surfaces, Weight: 0.440924524 pounds, Manufacturer: Stanley Black & Decker