STABILA 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. A ideal system. 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. Features Every level is electronically adjusted, then accuracy inspected and certified Vials read the same in all positions Bright easy to read vials will not leak, break, fog or require re-calibration Level accuracy assured for life Rib-reinforced frame for high-strength and lightweight Frame will not warp or twist Rubberized hand grips for comfort and grip Shock-absorbing end caps prevent slipping on walls and are removable to carry lines tight into corners Endcaps can be removed to carry pencil lines tight into corners