Extendable spirt level with strong multi-chamber aluminum frame and removable stand-offs that can reach around braces. Plub vial always at eye level. Handholes for comfort and grip. Reinforcing ribs for high strength. Continous bridge over horizontal vial increases frame strength. Plastic end caps protect the profile against impact. Two measuring surfaces for measuring in normal and revers positions. STABILA vial technology delivers long-term accuracy. Scales printed on both sides of extension pole for fast set ups.