Stabila 34712 Type 106TM magnetic 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 "plate to plate" measurements on most residential and commercial wall heights. Fully sealed solid rail (six sided) extension eliminates deflection and delivers the smoothest extension movement available. Also featuring a top horizontal vial that is permanently placed at eye level and plate height dimension marked on the rail - includes one Horizontal (level) and two Vertical (plumb) vials. Vials are guaranteed for life never to fog, leak or require adjustment. Work hands free: vertical, horizontal, overhead.