"Torpedo, Scaffold & Boat Level / The 81SVW45 has a fixed 45° vial - ideal for direct checking of struts and pipes at 45° and has rare earth magnets for extra secure adhesion to pipes and other steel items. It features a die-cast frame with 1 milled measuring face. The horizontal and vertical vials will read in the normal and overhead positions. Accuracy is °0.5mm per metre normal and °0.75mm per metre, overhead. Protective noses prevent damage to the milled face. Six ring vial for 1 % and 2 % slopes Lengt"