diff --git a/Elwig/Helpers/Gradation.cs b/Elwig/Helpers/Gradation.cs
deleted file mode 100644
index 3f8acce..0000000
--- a/Elwig/Helpers/Gradation.cs
+++ /dev/null
@@ -1,47 +0,0 @@
-namespace Elwig.Helpers {
-    // 1 °KMW = 
-    // 1 °NM  = kg/100L = 10g/L
-    // 1 °Oe  = 
-    // 1 °Bé  =
-    // 1 °Bx  = g/100g (x Gramm Zucker pro 100 Gramm Flüssigkeit)
-    internal class Gradation {
-        /// <summary>
-        /// Gradation in mg/L.
-        /// </summary>
-        uint mgpl;
-
-        public Gradation(uint mgpl) {
-            this.mgpl = mgpl;
-        }
-
-        public static double relativeDensity(double todo) {
-            return 0;
-        }
-
-        public static double KmwToOe(double kmw) {
-            return 0;  // TODO
-        }
-
-        public static double OeToKmw(double oe) {
-            return 0;  // TODO
-        }
-
-        public static Gradation FromKmw(double kwm) {
-            return new Gradation(0);  // TODO
-        }
-
-        public static Gradation FromKmw(double kmw, double t) {
-            // The temperature can be ignored, because no volumetric unit is involved.
-            // 1 °KMW = 1g/100g
-            return FromKmw(kmw);
-        }
-
-        public static Gradation FromOe(double oe) {
-            return new Gradation(0);  // TODO
-        }
-
-        public static Gradation FromOe(double oe, double t) {
-            return null;
-        }
-    }
-}