Box section levels made from high quality Aluminium with three permanently fixed shock resistant acrylic UV resistant vials, 300mm - one horizontal and one vertical vials, 600mm,900mm and 1200mm - one horizontal and two vertical vials, precision milled bottom. V - Groove for levelling pipework. All the levels are electrostatically epoxy powder coated and baked for maximum protection. Fitted with shock absorbing end caps. Accuracy of 0.5mm per 1M = 0.029° ; in standard position.