Smooth aluminum rectangular profile. The coated measuring surface protects sensitive surfaces. It is easy to clean thanks to the smooth side surfaces and electrostatic powder coating. Plastic end caps protect the profile from impacts. STABILA mounting technology ensures long-term precision, with measuring accuracy in normal position of ± 0.5 mm/m and in folding position of ± 1.0 mm/m. Features include one horizontal bubble, one vertical bubble, and one coated measuring surface. The smooth aluminum profile is easy to clean and suitable for measurements in envelope position.