Stabile Levels are unparalleled with regard to their accuracy and dependability. The secret - the vials made of block acrylic glass are firmly epoxy-locked in the frame. The vial is firmly cast in the high strength aluminum frame with non-shrink epoxy. No re-adjustment, no realignment, no tensioning against springs made of steel or fatigued plastic, no welding or clamping stresses. Just as accurate after 10 years as on the first day. Applications Especially suitable for craftsmen who subject their tools to extremely demanding conditions and need to measure in all positions for example, in bricklaying and carpentry, in wood construction, reinforced concrete construction, window fitting, road construction and landscaping work. Certified Level Accuracy Certified Level Accuracy . 029 degrees - 1/32in over 72 inches - 0. 5mm per meter right-side up or upside down. Every level is electronically adjusted, then accuracy inspected and certified. Shock-Absorbing Removable Endcap sit prevents slipping on walls and marking walls. Endcaps can be removed to carry pencil lines tight into corners.