This is proven to save time and money. The mental arithmetic and the cumbersome handling with several measuring tools is eliminated. The improvement with the gypsum cup is eliminated. The combination spacing of the drill holes is 71 mm according to DIN 49075. Light metal rectangular profile with marking holes, end caps with anti-slip stoppers on both sides. 1 vertical level and 1 horizontal level. Measuring accuracy: In normal position 0.029 ° = 0.5 mm / m. Length 43 cm. Art. No. 16135.