Stabila 35712 Type 106T plate level - extends 7' to 12' - features a three chamber rectangular aluminum profile with reinforcing ribs, two coated measuring surfaces, and overhead (vial down) measurement. Extremely long extendable spirit level that adjusts for "plate to plate" measurements on most residential and commercial wall heights. Fully sealed solid rail (six sided) extension eliminates flex and deflection, and delivers the smoothest extension movement available. Also featuring removable 1-5/8" stand-off reach around braces, a top horizontal vial that is permanently positioned at eye level, and a printed scale on slide extension allowing the level to be pre-set and locked to the correct wall height - includes one Horizontal (level) and two Vertical (plumb) vials. Vials are guaranteed for life never to fog, leak or require adjustment.