The Stabila 81S Torpedo Level has a distinctive shape that shows it is a special type. It is made from a strong cast aluminium T-profile, making it easy to hold. The particularly slender trapezoidal bevelled shape makes it suitable for working in cramped spaces. The die-cast frame has 1 milled measuring face and protecting noses to prevent damage to the milled face. Specification: 2 Vials: 1 plumb and 1 horizontal. Accuracy: Normal Position: 0.029=0.5mm/m. Accuracy: Overhead Position: 0.043=0.75mm/m.