High-quality telescopic system for extending the measuring surface. The level can be flexibly extended to the required length. The marking edge along the full length allows for measuring and marking in one operation, even when extended. Printed metric scale for determining internal dimensions and clear dimensions. LOCK system for fixing the set length prevents unintentional adjustment of the level. Integrated slip stoppers ensure a secure fit when marking, preventing the level from slipping. High-quality extension mechanism ensures high measurement accuracy: in normal position (closed ± 0.5 mm/m and extended ± 1.0 mm/m) and in inverted position (closed ± 0.75 mm/m and extended ± 1.0 mm/m). Plastic end caps protect the profile from impacts. Features: 1 horizontal vial, 1 vertical vial, 1 measuring surface, telescopic system, 1 continuous marking edge, 1 printed metric scale.