Innovative knife sharpener for left and right-handed use. Two levels are available for sharpening knives, depending on how much cutting performance has been lost. The first level, “Coarse”, is recommended for when the knife is blunt. The second level, “Fine”, is suitable both for fine sharpening following on from the first level or for regular resharpening of the blade. The ceramic slats grind the blade and the knife regains its original sharpness.