The stabila 81s torpedo level has 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 milled face additional magnets mounted in the milled measuring surface securely hold this level to scaffolding or beams 2 vials 1 plumb 1 horizontal accuracy normal position 002905mmm accuracy overhead position 00430