Extendable spirit level with a stable 3-chamber aluminium rectangular profile and permanently mounted spacers for bridging unevenness on building elements. Additional clip-on spacers (height: 4.2 cm) allow for precise measurements even over battening. The unique telescope system provides an extremely long measuring surface. Strong clamping eccentrics ensure lasting measuring accuracy. Reach-through openings offer a secure grip when working. The profile features reinforcing ribs for high stability. A continuous web over the horizontal vial additionally stabilizes the profile. Plastic end caps protect the profile from impacts. The telescopic rod includes a cm/in scale. Stabila built-in technology ensures long-term precision, with measuring accuracy in normal position (closed) ± 0.5 mm/m and in folding position (closed) ± 0.75 mm/m. Features include 1 horizontal bubble, 2 vertical bubbles, 2 measuring surfaces, 2 reach-through openings, a telescopic rod, and clip-on spacers.