Precision invar levelling staff 3M

Product Description

More photos are available
Random grad. errors are less than **0.**5 mm
Graduation *7a (1.0 cm)
Length 3 m
Weight 5.5kg

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.