●Professional workmanship - we produce the spirit levels with the greatest possible care and attention to detail; Double-sided milled for a perfectly flat surface ensures precision and excellent ground contact ●Single-chamber profile - guarantees very good resistance to mechanical damage; The thickened walls and embossing provide flexural and torsional strength ●ERS+ (Easy Reading System Plus) - Quick and easy reading thanks to the even larger vertical and horizontal displays with magnifying effect; Bubble levels are made of high quality acrylic glass; Now with additional rings for determining 2% slope ●Impact resistant - the level has elastomer caps on both short ends that absorb the energy of impacts; In combination with the recess, this provides great protection and increases resistance to loss of measurement accuracy ●2% slope indication - The vertical marker is additionally marked with two lines, the end of which indicates a slope of 2%. This allows for a more accurate measurement and definition of the margin of error.