High quality, hardened aluminium girder section levels with three permanently fixed solid acrylic cylindrical shock resistant UV resistant vials, one horizontal, one vertical with side view feature and one 45� vial. Levels electrostatically, epoxy powder coated and baked for maximum protection. Metric/imperial rule on top edge. Fitted with shock absorbing end caps. V-Groove for levelling pipework. Accuracy 1.75mm per 1M = 0.1� in standard position.