This level is exactly what the pro's asked for and needed. The STABILA R-Type 300 level has been specially developed to withstand the toughest site conditions. It has been designed to be extremely strong, lightweight, torsion-resistant - thanks to a five-chamber R-profile - and easy to use. It has an extra large measuring surface that prevents the level from tipping during use. This makes the R 300 unlike any other level you have ever used before. Today, this level represents the best level product that STABILA manufactures. Invest in the R-beam and you set the tone on the site.