Equipped with 3 spirit vials, horizontally (180°), vertically (90°), and at an angle (45°).Aluminium frame construction to reinforced and prevent warping.With two precision-milled measuring surface on both sides.Plus heavy-duty, shock-absorbing rubber end caps.Featuring a V-groove that is designed to fit against round surfaces such as pipes. Specifications: Model no: TMT24086 Accuracy: 0.5mm/m Material Aluminium, Acrylonitrile butadiene styrene (ABS), Rubber Length: 40cm Thickness: 1.5mm V-shape slot for measuring objects with round surface