STABILA levels are unparalleled with regard to their accuracy and dependability The secret the vials made of block acrylic glass are firmly epoxylocked in the frame A ideal system The vial is firmly cast in the highstrength aluminum frame with nonshrink epoxy No readjustment, 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