Leosurvey high precision Invar levelling staffs are used for First-order and Second-order leveling. They can be used on large scale construction sites, for example roads, dams, tunnels, mines, power plants and building monitoring.

The essence of manufacturing Invar levelling staff is the formation of strips on the Invar tape. Leosurvey possesses advanced coding and engraved system and technology. It takes laser interferometer as length standard. The graduation of the precision Invar levelling staff is engraved in the paint coating with an interferometrically controlled laser beam, ensuring superior graduation accuracy and edge sharpness.

The 3M invar staff’s standard deviation of graduation is less than 5μm. Leosurvey precision Invar leveling staffs outperform the international standard.

1. Staff tape is made of Invar material. The coefficient of thermal expansion is very small(1.0×10-6/℃/M)

2. Superior graduation accuracy and high quality image of stripes.

3. Body of the Invar staff made of rigid aluminum profile with anodized surface. It makes sure it is not easy to get deformed in the process of measurements and very convenient to carry.

4. Invar tape seated in a protection groove of staff profile and tensioned by soft spring to compensate extension coefficient of staff profile.

5. Foot plate of chrome-alloy; hardened, smooth and ground.

6. Equipped with two circular bubbles and fold-away handles. Handles zinced and powder-coated.

7. Staff Length is customizable according to customers’ needs.