Invar levelling staff

Nedo precision Invar levelling staffs are used for first-order levelling and for challenging work on large construction sites, for example tunnels, roads, dams or power plants.
The graduation of the precision Invar levelling staffs is engraved in the paint coating with an interferometrically controlled laser beam, ensuring superior graduation accuracy and edge sharpness . Random graduation errors are less than ± 0.**5 mm.

• Body of the invar staff made of rigid aluminium profile with anodised surface;
• Yellow lacquered graduation side; print protected by polyester coating (1 mm thick);
• Invar tape seated in a protection groove of staff profile and tensioned by soft spring 
  to compensate extension coefficient of staff profile. Extension coefficient: < 1.5 x ***6;
• Foot plate slightly protrudes from staff body; 
• Foot plate of chrome-alloy, chemically nickel-plated steel; hardened and ground;
• Equipped with circular bubble and fold-away handles as a standard. Handles 
  zinced and powder-coated.